preliminary motorola semiconductor technical data mc68177 ? motorola, inc. 1998 advance information this document contains information on a new product. specifications and information herein are subject to change without notice . flexa decoder ic the mc68177 flex a ic simplites implementation of a flex paging device by interfacing with any of several off-the-shelf paging receivers and any of several off-the-shelf host microcontroller/microprocessors. its primary function is to process information received and demodulated from a flex radio paging channel, select messages addressed to the paging device, and communicate the message information to the host. the mc68177 also operates the paging receiver in an eftcient power consumption mode and enables the host to operate in a low-power mode when monitoring a single channel for message information. the block diagram shown below illustrates the major components and functions of the mc68177 ic. figure 1 block diagram exts0 exts1 symclk xtal extal clkout s1-s7 vdd vss test3 reset lobat ready spi 7 4 oscpd 2 2 test2 s0/ifin receiver control demodulator & data slicer symbol sync sync correlator 76.8 khz or 160 khz oscillator clock generator de-interleaver error corrector local message filter spi buffer spi control/status registers address comparator/ correlator external control unit noise detector internal control unit s0 ifin s1-s7
preliminary 2 mc68177 motorola mc68177 features features flex paging protocol signal processor 16 programmable user address words 16 txed temporary addresses 16 operator messaging addresses 1600, 3200, and 6400 bits per second decoding any-phase or single-phase decoding uses standard serial peripheral interface (spi) in slave mode allows low current stop mode operation of host processor highly programmable receiver control realtime clock time base flex fragmentation and group messaging support realtime clock over-the-air update support compatible with synthesized receivers low battery indication (external detector) 32-pin qfp package backward compatible to the mc68175 flex decoder ic internal demodulator and data slicer improved battery savings via partial correlation and intermittent receiver clock full support for revision 1.9 of the flex protocol
mc68177 pin description preliminary motorola mc68177 3 pin description table 1 mc68177 pin description symbol i/o 32-pin qfp pin # description vdd (2 pins) ? 3, 13 power vss (2 pins) ? 7, 29 ground oscpd input 2 internal oscillator power down. connected to vss when using internal oscillator. connected to vdd when using an external source. test2 input 4 ic manufacturing test mode pin. normally connected to vss . test3 input 8 ic manufacturing test mode pin. normally connected to vss . reset input 24 active low reset to the flex decoder ic exts1 input 11 msb of the symbol currently being decoded exts0 input 12 lsb of the symbol currently being decoded lobat input 10 low battery detect input ss input 27 slave select for spi communications sck input 28 serial clock for spi communications mosi input 30 data input for spi communications miso output 31 three-state data output for spi communications ready output 26 driven low when the ic is ready for an spi packet clkout output 32 38.4 khz or 40 khz clock output (derived from oscillator) symclk output 14 recovered symbol clock extal input 6 76.8 khz crystal input or external input xtal output 5 76.8 khz clock output s0/ifin output/ input 23 receiver control output when using external demodulator limited if input when using internal demodulator s1 - s7 output 22, 21, 20, 19, 18, 16, 15 eight three-state receiver control ports
preliminary 4 mc68177 motorola mc68177 application examples application examples the mc68177 ic connects to a receiver capable of converting a 4 level audio signal into a 2-bit digital signal. the flex decoder ic has eight receiver control lines used for warming up and shutting down a receiver in stages. the flex decoder ic has dual bandwidth control signals for two post detection tlter bandwidths for receiving the two symbol rates of the flex signal. the flex decoder ic has the ability to detect a low battery signal during the receiver control sequences. it interfaces to a host mcu through a standard spi. it has a 38.4 khz clock output capable of driving other devices. it has a one minute timer that offers low-power support for a time-of-day function on the host. mc68176 a/d converter 38.4 clock 76.8 khz oscillator exts1 receiver control synthesizer programming control receiver low battery detector lobat host microprocessor user interface exts0 audio mc68177 figure 2 example block diagram using external demodulator
mc68177 application examples preliminary motorola mc68177 5 application examples the mc68177 chip also has an internal demodulator. when using the internal demodulator, a limited (i.e. 1-bit digitized) 455 khz or 140 khz if signal is fed from the receiver into the flex decoder ic via the s0/ifin pin. when using the internal demodulator, the oscillator frequency (or external clock) must be 160 khz. the clkout signal can be programmed to be either a 38.4 khz signal created by fractionally dividing the oscillator clock, or a 40 khz signal creating by dividing the oscillator clock by 4. 38.4 or 40 khz clock 160 khz oscillator s0/ifin receiver control synthesizer programming control receiver low battery detector lobat host microprocessor user interface mc68177 figure 3 example block diagram using internal demodulator
how to reach us: usa/europe/locations not listed : motorola literature distribution p.o. box 5405 denver, colorado 80217 1 (800) 441-2447 1 (303) 675-2140 mfaxa : rmfax0@email.sps.mot.com touchtone (602) 244-6609 usa and canada only: 1 (800) 774-1848 asia/pacific : motorola semiconductors h.k. ltd. 8b tai ping industrial park 51 ting kok road tai po, n.t., hong kong 852-26629298 technical resource center: 1 (800) 521-6274 dsp helpline dsphelp@dsp.sps.mot.com japan : nippon motorola ltd. spd, strategic planning office 4-32-1, nishi- gotanda shinagawa-ku, tokyo 141, japan 81-3-5487-8488 internet : http://www.motorola.com/sps motorola, flex, and the flex logo are registered trademarks of motorola, inc. motorola reserves the right to make changes without further notice to any products herein. motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. typical parameters which may be provided in motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including typicals must be validated for each customer application by customer?s technical experts. motorola does not convey any license under its patent rights nor the rights of others. motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support life, or for any other application in which the failure of the motorola product could create a situation where personal injury or death may occur. should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that motorola was negligent regarding the design or manufacture of the part. motorola and are registered trademarks of motorola, inc. motorola, inc. is an equal opportunity/affirmative action employer. furthur information about sps?s wireless products is available at http://www.mot.com/sps/ wireless. information on flex technology is available on motorola?s web site at http:// www.motorola.com/flex.
mc68177 application examples preliminary motorola mc68177 7
preliminary 8 mc68177 motorola mc68177 application examples
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