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| 2 am186 tm er and am188 tm er microcontrollers preliminary AM186ER microcontroller block diagram note: * all pio signals are shared with other physical pins. see the pin descriptions beginning on page 26 and table 2 on page 31 for information on shared functions. registers control s 2 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 (wdt)2 0 1 max count b registers refresh control unit control registers control registers control registers clkoutb clkouta int4 int3/inta 1/irq int2/inta 0 int1/select int0 tmrout0 tmrout1 drq0 drq1 v cc gnd tmrin0 tmrin1 ardy srdy dt/r den hold hlda asynchronous serial port synchronous serial interface txd rxd sclk sdata sden0 sden1 nmi a19Ca0 ad15Cad0 ale bhe /aden wr wlb whb rd res lcs /once 0 mcs 2Cmcs 0 pcs 6/a2 pcs 3Cpcs 0 pcs 5/a1 ucs /once 1 x2 x1 control registers psram control unit mcs 3/rfsh pio unit pio31C pio0* s6/ uzi / clksel 2 clksel 1 32 kbyte ram (16k x 16) s 1/imdis s 0/sren
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