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LSI/CSI
UL
(R)
LS7166
(631) 271-0400 FAX (631) 271-0405 January 2003
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747
A3800
24-BIT QUADRATURE COUNTER
FEATURES: * Programmable modes are: Up/Down, Binary, BCD, 24 Hour Clock, Divide-by-N, x1 or x2 or x4 Quadrature and Single-Cycle. * DC to 20MHz Count Frequency. * 8-Bit I/O Bus for Microprocessor Communication and Control. * 24-Bit comparator for pre-set count comparison. * Readable status register. * Input/Output TTL and CMOS compatible. * 5V operation (Vdd - Vss). * LS7166 (DIP); LS7166-S (SOIC); LS7166-TS24 (24-Pin TSSOP)* - See Fig. 1 GENERAL DESCRIPTION: The LS7166 is a CMOS, 24-bit counter that can be programmed to operate in several different modes. The operating mode is set up by writing control words into internal control registers (see Figure 8). There are three 6-bit and one 2-bit control registers for setting up the circuit functional characteristics. In addition to the control registers, there is a 5-bit output status register (OSR) that indicates the current counter status. The IC communicates with external circuits through an 8-bit three state I/O bus. Control and data words are written into the LS7166 through the bus. In addition to the I/O bus, there are a number of discrete inputs and outputs to facilitate instantaneous hardware based control functions and instantaneous status indication. REGISTER DESCRIPTION: Internal hardware registers are accessible through the I/O bus (D0 - D7) for READ or WRITE when CS = 0. The C/D input selects between the control registers (C/D = 1) and the data registers (C/D = 0) during a READ or WRITE operation. (See Table 1)
20-Pin Package PIN ASSIGNMENT - Top View
*(Contact factory for 24-Pin TSSOP Package Pinout)
(Write Input) WR
1 2 3 20 19 18
VSS (GND) RD (Read Input) C/D (Control/ Data Input) BW (Borrow Output) CY (Carry Output) D7 D6 D5 D4 D3
LSI
(Chip Select Input) CS (Load Counter/Load Latch) LCTR/LLTC (A, B Gate/Reset Counter)ABGT/RCTR VDD (+5V) (Count Input) A (Count Input) B D0 D1 D2
LS7166
FIGURE 1
4 5 6 7 8 9 10
17 16 15 14 13 12 11
The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use.
7166-012703-1
PR (Preset register). The PR is the input port for the CNTR. The CNTR is loaded with a 24 bit data via the PR. The data is first written into the PR in 3 WRITE cycle sequence of Byte 0 (PR0), Byte 1 (PR1) and Byte 2 (PR2). The address pointer for PR0/PR1/PR2 is automatically incremented with each write cycle. Accessed by: WRITE when C/D = 0, CS = 0. Bit # 7----------0 PR2 (BYTE 2) 7---------- 0 PR1 (BYTE 1) 7----------0 PR0 (BYTE 0)
Standard Sequence for Loading PR and Reading CNTR: 1 MCR ; Reset PR address pointer WRITE PR ; Load Byte 0 and into PR0 increment address WRITE PR ; Load Byte 1 and into PR1 increment address WRITE PR ; Load Byte 2 and into PR3 increment address 8 MCR ; Transfer PR to CNTR
MCR (Master Control Register). Performs register reset and load operations. Writing a "non-zero" word to MCR does not require a follow-up write of an "all-zero" word to terminate a designated operation. Accessed by: WRITE when C/D = 1, CS = 0. Bit # 765 00 4 3 2 1 0
1: Reset PR/OL address pointer 1: Transfer CNTR to OL (24 bits) 1: Reset CNTR, BWT and CYT. Set SIGN bit. (CNTR = 0, BWT = 0, CYT = 0, SIGN = 1) 1: Transfer PR to CNTR (24 bits) 1: Reset COMPT (COMPT = 0) 1: Master reset. Reset CNTR, ICR, OCCR, QR, BWT, CYT, OL COMPT, and PR/OL address pointer. Set PR (PR = FFFFFF) and SIGN. 0: Select MCR 0: NOTE: Control functions may be combined. ICR (Input Control Register). Initializes counter input operating modes. Accessed by: WRITE when C/D = 1, CS = 0. Bit # 7 6 5 4 3 2 1 0 01 0: Input A = Up count input, Input B = Down count input 1: Input A = Count input, Input B = Count direction input (overridden in quadrature mode) where B = 0 selects up count mode and B = 1 selects Down count mode. (NOTE: During counting operation B may switch only when A = 1.) 0: NOP 1: Increment CNTR once (A/B = 1, if enabled) 0: NOP 1: Decrement CNTR once (A/B = 1, if enabled) 0: Disable inputs A/B 1: Enable inputs A/B 0: Initialize Pin 4 as CNTR Reset input (Pin 4 = RCTR) 1: Initialize Pin 4 as Enable/Disable gate for A/B inputs (Pin 4 = ABGT) 0: Initialize Pin 3 as CNTR load input (Pin 3 = LCTR) 1: Initialize Pin 3 as OL load input (Pin 3 = LLTC) 1: Select ICR 0: NOTE: Control functions may be combined.
7166-012703-2
TABLE 1 - Register Addressing Modes D7 D6 C/D RD WR CS XXXX X1 001 1 0 0 1 1 X 1 0 1 X 1 1 1 0 1 1 1 1 0 0 0 0 COMMENT Disable Chip for READ/WRITE Write to Master Control Register (MCR) Write to input control register (ICR) Write to output/counter control register (OCCR) Write to quadrature register (QR) Write to preset register (PR) and increment register address counter. Read output latch (OL) and increment register address counter Read output status register (OSR).
X
X
0
1
0
X
X
1
1
0
X = Don't Care OSR (Output Status Register). Indicates CNTR status: Accessed by: READ when C/D = 1, CS = 0.
Bit # 765 4 3 2 1 0 U U U 0/1 0/1 0/1 0/1 0/1 BWT. Borrow Toggle Flip-Flop. Toggles everytime CNTR underflows generating a borrow. CYT. Carry Toggle Flip-Flop. Toggles everytime CNTR overflows generating a carry. COMPT. Compare Toggle Flip-Flop. Toggles everytime CNTR equals PR SIGN. Sign bit. Reset ( = 0) when CNTR underflows Set ( = 1) when CNTR overflows UP/DOWN. Count direction indicatior in quadrature mode. Reset ( = 0) when counting down Set ( = 1) when counting up (Forced to 1 in non-quadrature mode)
U = Undefined
OL(Output latch). The OL is the output port for the CNTR. The 24 bit CNTR Value at any instant can be accessed
by performing a CNTR to OL transfer and then reading the OL in 3 READ cycle sequence of Byte 0 (OL0), Byte 1 (OL1) and Byte 2 (OL2). The address pointer for OL0/OL1/OL2 is automatically incremented with each READ cycle. Accessed by: READ when C/D = 0, CS = 0. Bit #
7
OL2 (BYTE 2)
0
7
OL1 (BYTE 1)
0
7
OL0 (BYTE 0)
0
Standard Sequence for Loading and Reading OL: 3 MCR ; Reset OL address pointer and Transfer CNTR to OL READ OL ; Read Byte 0 and increment address READ OL ; Read Byte 1 and increment address READ OL ; Read Byte 2 and increment address
7166-012703-3
OCCR (Output Control Register) Initializes CNTR and output operating modes. Accessed by : WRITE when C/D = 1, CS = 0. Bit # 76543210 10 0: 1: 0: 1: Binary count mode (Overridden by D3 = 1). BCD count mode (Overridden by D3 = 1) Normal count mode Non-Recycle count mode. (CNTR enabled with a Load or Reset CNTR and disabled with generation of Carry or Borrow. In this mode no external CY or BW is generated. Instead CYT or BWT should be used as cycle completion indicator.) 0: Normal count mode 1: Divide by N count mode (CNTR is reloaded with PR data upon Carry or Borrow). 0: Binary or BCD count mode (see D0) 1: 24 Hour Clock mode with Byte 0 = Sec, Byte 1 = Min and Byte 2 = Hr. (Overrides BCD/Binary Modes) 0 Pin 16 = CY, Pin 17 = BW. (Active Low) 0 1 0 0 1 1 1 0 1 Select OCCR Pin 16 = COMP, Pin 17 = COMPT Pin 16 = CY, Pin 17 = BW. (Active high) Pin 16 = CYT, Pin 17 = BWT
QR (Quadrature Register). Selects quadrature count mode (See Fig. 7) Accessed by: WRITE when C/D = 1, CS = 0. Bit # 7654 3210 11XXXX 0 0 1 0 0 1 1 1 1 1 X = Don't Care
7166-012703-4
Disable quadrature mode
Enable x1 quadrature mode
Enable x2 quadrature mode
Enable x4 quadrature mode
Select QR
I/O DESCRIPTION: (See REGISTER DESCRIPTION for I/O Prgramming.)
Data-Bus (D0 - D7) (Pin 8 - Pin 15). The 8-line data bus is a three-state I/O bus for interfacing with the system bus. CS (Chip Select Input) (Pin 2). A logical "0" at this input enables the chip for Read and Write. RD (Read Input) (Pin 19). A logical "0" at this input enables the OSR and the OL to be read on the data bus. WR (Write Input) (Pin 1). A logical "0" at this input enables the data bus to be written into the control and data registers. C/D (Control/Data Input) (Pin 18). A logical "1" at this input enables a control word to be written into one of the four control registers or the OSR to be read on the I/O bus. A logical "0" enables a data word to be written into the PR, or the OL to be read on the I/O bus. A (Pin 6). Input A is a programmable count input capable of functioning in three different modes, such as up count input, down count input and quadrature input. B (Pin 7). Input B is also a programmable count input that can be programmed to function either as down count input, or count direction control gate for input A, or quadrature input. When B is programmed as count direction control gate, B = 0 enables A as the Up Count input and B = 1 enables A as the Down Count input. When programmed as the direction input, B can switch state only when A is high. ABGT/RCTR (PIN 4). This input can be programmed to function as either inputs A and B enable gate or as external counter reset input. A logical "0" is the active level on this input. In non-quadrature mode, if Pin 4 is programmed as A and B enable gate input, it may switch state only when A is high (if A is clock and B is direction) or when both A and B are high (if A and B are clocks. In quadrature mode, if Pin 4 is programmed as A and B enable gate, it may switch state only when either A or B switches. LCTR/LLTC (PIN 3). This input can be programmed to function as the external load command input for either the CNTR or the OL. When programmed as counter load input, the counter is loaded with the data contained in the PR. When programmed as the OL load input, the OL is loaded with data contained in the CNTR. A logical "0" is the active level on this input. CY (Pin 16). This output can be programmed to serve as one of the following: A. CY. Complemented Carry out (active "0"). B. CY. True Carry out (active "1"). C. CYT. Carry Toggle flip-flop out. D. COMP. Comparator out (active "0") BW (Pin 17). This output can be programmed to serve as one of the following: A. BW. Complemented Borrow out (active "0"). B. BW. True Borrow out (active "1"). C. BWT. Borrow Toggle flip-flop out. D. COMPT. Comparator Toggle output. VDD (Pin 5). Supply voltage positive terminal. VSS (Pin 20). Supply voltage negative terminal.
Absolute Maximum Ratings: Parameter Symbol Voltage at any input VIN Operating Temperature TA Storage Temperature TSTG Supply Voltage VDD - VSS
Values VSS - 0.3 to VDD + 0.3 0 to +70 -65 to +150 +7.0
Unit V oC oC V
DC Electrical Characteristics. (All voltages referenced to VSS. TA = 0 to 70C, VDD = 4.5V to 5.5V, fc = 0, unless otherwise specified) Parameter Supply Voltage Supply Current Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage Input Current Output Source Current Output Sink Current Data Bus Off-State Leakage Current Symbol VDD IDD VIL VIH VOL VOH ISRC ISINK Min. Value 4.5 0 2.0 2.5 200 4 Max.Value 5.5 350 0.8 VDD 0.4 15 15 Unit V A V V V V nA A mA nA Remarks Outputs open 4mA Sink 200A Source Leakage Current VOH = 2.5V VOL = 0.4V -
7166-012703-5
TRANSIENT CHARACTERISTICS (See Timing Diagrams in Fig. 2 thru Fig. 7, VDD = 4.5V to 5.5V, TA = 0 to 70C, unless otherwise specified) Parameter Clock A/B "Low" Clock A/B "High" Clock A/B Frequency (See NOTE 1) Clock UP/DN Reversal Delay LCTR Positive edge to the next A/B positive or negative edge delay Clock A/B to CY/BW/COMP "low" propagation delay Clock A/B to CY/BW/COMP "high" propagation delay LCTR and LLTC pulse width Clock A/B to CYT, BWT and COMPT "high" propagation delay Clock A/B to CYT, BWT and COMPT "low" progagation delay WR pulse width RD to data out delay (CL = 20pF) CS, RD Terminate to Data-Bus Tri-State Data-Bus set-up time for WR Data-Bus hold time for WR C/D set-up time for RD C/D hold time for RD C/D set-up time for WR C/D hold time for WR CS set-up time for WR CS holdtime for WR Quadrature Mode: Clock A/B Validation delay (See NOTE 2) A and B phase delay Clock A/B frequency CY, BW, COMP pulse width Symbol TCL TCH fc TUDD TLC Min.Value 20 30 0 100 100 Max.Value No Limit No Limit 20 Unit ns ns MHz ns ns
TCBL
-
65
ns
TCBH
-
85
ns
TLCW TTFH
60 -
100
ns ns
TTFL
-
100
ns
TWW TR TRT
60 -
110 30
ns ns ns ns (see Note 3) ns (see Note 3) ns ns ns (see Note 3) ns (see Note 3) ns (see Note 3) ns (see Note 3) ns ns MHz ns
TDS TDH TCRS TCRH TCWS TCWH TSWS TSWH
15 30 15 30 15 30 0 0
-
TCQV TPH fCQ TCBW
208 75
160 1.2 180
NOTE 1: A) In Divide-by-N mode, the maximum clock frequency is 10 MHz. B) The maximum frequency for valid CY, BW, CYT, BWT, COMP, COMPT is 10 MHz. NOTE 2: In quadrature mode A/B inputs are filtered and required to be stable for at least TCQV length to be valid. NOTE 3: All WR specifications are critical for proper operation of LS7166
7166-012703-6
LTCR
TLC
TLCW
UP CLK (A)
TCH
TCL
TUDD
DN CLK (B)
TCL
TCH
Q0 (Internal) Q1 (Internal) Q2-Q23 (Internal)
CNTR=FFFFFD (PR=CNTR) CNTR=FFFFFE CNTR=FFFFFF CNTR=000000 CNTR=0000001 CNTR=000000 CNTR=FFFFFF CNTR=FFFFFE CNTR=FFFFFD (PR=CNTR)
COMP CY BW
NOTE 2
FIGURE 2 . LOAD COUNTER, UP CLOCK, DOWN CLOCK, COMPARE OUT, CARRY, BORROW
NOTE 1: The counter in this example is assumed to be operating in the binary mode. NOTE 2: No COMP output is generated here, although PR = CNTR. COMP output is disabled with a counter load command and enabled with the rising edge of the next clock, thus eliminating invalid COMP outputs whenever the CNTR is loaded from the PR. NOTE 3: When UP Clock is active, the DN Clock should be held "HIGH" and vice versa.
UP CLK OR DN CLK TCBH TCBL CY TTFH TTFL
CYT TCBL BW TCBH
TTFL TTFH
BWT TCBL TCBH COMP TTFH COMPT SIGN (INTERNAL) TTFL
FIGURE 3. CLOCK TO CY/BW OUTPUT PROPAGATION DELAYS
7166-012703-7
CS, C/D TCRS RD TCRH
TRD DATA BUS
VALID OUTPUT
TRT
CS, C/D
TCWS WR TSWS TDS DATA BUS
TWW TSWH
TCWH
TDH VALID DATA
FIGURE 4. READ/WRITE CYCLES
LCTR
DN CLK
Q0 (INTERNAL)
Q1 (INTERNAL) Q2-Q23 (INTERNAL)
CNTR=3
CNTR LD (INTERNAL) BW
=2
=1
=0
=3
=2
=1
=0
=3
NOTE: EXAMPLE OF DIVIDE BY 4 IN DOWN COUNT MODE
FIGURE 5. DIVIDE BY N MODE
CNTR LOAD (LCTR or MCR BASED) UP CLK OR DN CLK
CY or BW
CNTR DISABLED
CNTR ENABLED
CNTR DISABLED
FIGURE 6 . CYCLE ONCE MODE
7166-012703-8
FORWARD A
TPH TPH
REVERSE
B
UPCLK (X1) (Internal) DNCLK (X1) (Internal) UPCLK (X2) (Internal) DNCLK (X2) (Internal) UPCLK (X4) (Internal) DNCLK (X4) (Internal) UP/DN(OSR Bit 4) CY BW TCBW TCBW TCQV TCQV
FIGURE 7. QUADRATURE MODE INTERNAL CLOCKS
7166-012703-9
(DATA-BUS)
8-15
I/O BUFFER
D0 - D7 D0 -D4 OSR
D0, D6,D7 (CHIP SELECT INPUT) CS (READ INPUT) RD (WRITE INPUT) WR (CONTROL /DATA INPUT) C/D (COUNT INPUT) A (COUNT INPUT) B (AB GATE/LOAD LATCH) ABGT/RCTR (LOAD CTR/LOAD LATCH) LCTR/LLTC 2 19 1 18 6 7 4 3 INPUT BUFFER AND DECODE LOGIC
QR
D0 - D7
INTERNAL DATA BUS
OCCR
CONTROL LOGIC
D0 - D7
ICR STATUS LOGIC 16 CY (CARRY OUT) 17 BW (BORROW OUT)
D0 - D7
MCR
COMPARATOR
N1=N2 N1 N2
PR/OL ADDRESS PR0 (+5V) VDD (GND) VSS 5 20 D0 -D7 B0 - B7 PR1 B8 - B15 PR2 B16 - B23 PR/OL ADDRESS D0 - D7 UP CLOCK DN CLOCK B0 - B23 CNTR Q0 -Q23 OL1 OL2
OL0
FIGURE 8. LS7166 BLOCK DIAGRAM
7166-012703-10
FIGURE 9. 80C31/8051 TO LS7166 INTERFACE IN EXTERNAL ADDRESS MODE 8051 80C31 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 ALE
AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 2 3 4 5 6 7 8 9 11
74HC573 D1 Q1
19
7166 18 C 0C Q8 12 2 C/D CS/
1
AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7
8 9 10 11 12 13 14 15 1 19
D0 D1 D2 D3 D4 D5 D6 D7
WR/ RD/
WR/ RD/
NOTE: Port_0 is open drain output. Add pull-up resistors to all Port_0 I/0 lines.
VCC FIGURE 10. 8751 INTERFACE TO LS7166 IN I/O MODE UR VCC 31 ER/VP 19 18 9 X1 X2 RESET P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 RD WR PSEN ALE/P TXO RXO 39 38 37 36 35 34 33 32 21 22 23 24 25 26 27 28 17 16 29 30 11 10 /7166C/D /7166CS 5 6 7 3 4 R 8 BW LCTR/LLTC RBGT/RCTR VDD 16 CY 17
12 13 15 14 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 1 2 3 4 5 6 7 8
INT0 INT1 T0 T1 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7
8051
P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7
8 9 10 11 12 13 14 15
D0 D1 D2 D3 D4 D5 D6 D7
LS7166
WR RD C/D CS Vss 20
1 19 18 2
/7166WR /7166RD /7166C/D /7166CS
/7166RD /7166WR
7166-012703-11
+5V FIGURE 11. 8051 INTERFACE TO LS7166 I/O MODE C7 CAP 6 7 3 5 VDD U7 16 17
ISA BUSS D7 D6 D5 D4 D3 D2 D1 D0
A B
LCTR/LLTC 4 ABGT/RCTR D0 D1 D2 D3 D4 D5 D6 D7 8 9 10 11 12 13 14 15 D0 D1 D2 D3 D4 D5 D6 D7 Vss 20
AEN
WR 1 RD 19 18 C/D CS 2
IOR A0
A9 A8 A7 A6 A5 A4 A3 A2 A1 CLOCK A0 IOR IOW
1 ADDRESS DECODER 2 74MC32
3
VCC
4 2 3 D PR CLK Q 1 74HC04 2 1 74HC74 6 Q 5
7166-012703-12
+5V FIGURE 12. LS7166 TO 68HC11 INTERFACE
U1 30 XT 29 EX 39 RESET 41 IRQ 40 XIRD 8 PA0 7 PA1 6 PA2 17 18 19 20 PE0 PE1 PE2 PE3 PA3 PA4 PA5 PA6 PA7 5 4 3 2 1 PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC7 A0 CS/ VR/ RD/ U3 20 31 32 33 34 35 36 37 38 42 43 44 45 46 47 PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC7 PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC7 3 4 7 8 13 14 17 18 1 11 D0 D1 D2 D3 D4 D5 D6 D7 OC G 74HC373 +5V Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 2 5 6 9 12 15 16 19 8 9 10 11 12 13 14 15 18 2 1 19 VR RD GND D0 D1 D2 D3 D4 D5 D6 D7 C/D CS VDD 16 CY BW LCTR/LLTC RBGT/RCTR LS7166 A COUNT IN B COUNT IN 6 7 17 3 4
PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC7 PD0 PD1 PD2 PD3 PD4 PD5
16 15 14 13 12 11 10 9
22 YRH 21 YRL
ADDRESS DECODE
4 2 D CLK Q6 CL 1 U5 A U6 A 1 2 U5 B 6 74HC08 3 4 74HC04 3 74HC08 74HC74 PR Q 5
MODA 25 MODB 24 E 27 AS 26 R/W 28
68HC11A1
1
2 74HC04 U6 B
4 5
7166-012703-13
FIGURE 13. 68000 INTERFACE TO LS7166
DATA BUS ADDRESS D CK R/W LDS/UDS 68000 68008 68010 AS SD DTACK CLK CLOCK Q S74 CK R QSD S74 CK R D Q A0
D0 - D7 C/D
LS373
DECODE
CS +V RD 7166 Q
S S74 R +V WR
CK
7166-012703-14

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