amd a d v a n c e i n f o r m a t i o n 3 am186es and AM188ES microcontrollers AM188ES microcontroller block diagram s 2s 0 interrupt control unit timer control unit dma unit bus interface unit execution unit chip-select unit clock and power management unit control registers 16-bit count registers max count a registers 16-bit count registers 20-bit destination pointers 20-bit source pointers control registers control registers control registers 01 2 0 1 max count b registers refresh control unit control registers control registers control registers clkoutb clkouta int6int4** int3/inta 1/irq int2/inta 0** int1/select int0 tmrout0 tmrout1 drq0** drq1** v cc gnd tmrin0 tmrin1 ardy srdy dt/r den /ds hold hlda asynchronous serial port 0 txd0 rxd0 nmi a19a0 ao15ao8 ale rfsh 2/aden wr wb rd res lcs /once 0 mcs 2mcs 0 pcs 6/a2 pcs 3pcs 0** pcs 5/a1 ucs /once 1 x2 x1 psram control unit mcs 3/rfsh pio unit pio31 pio0* control registers s6/lock / uzi clkdiv 2 txd1 rxd1 cts 0/enrx 0 cts 1/enrx 1** rts 0/rtr 0 rts 1/rtr 1** watchdog timer (wdt) pulse width demod- ulator (pwd) pwd** asynchronous serial port 1 ad7ad0 notes: * all pio signals are shared with other physical pins. see the pin descriptions beginning on page 29 and table 2 on page 35 for information on shared functions. ** pwd, int5, int6, rts 1/rtr 1, and cts 1/enrx 1 are multiplexed with int2/inta 0, drq0, drq1, pcs 3, and pcs 2 respectively. see the pin descriptions beginning on page 29.
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