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| amd p r e l i m i n a r y 3 am186em and AM188EM microcontrollers AM188EM 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 0 1 (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 s6/ a19a0 ad7ad0 ale wr wb rd res lcs /once 0 mcs 2mcs 0 pcs 6/a2 pcs 3pcs 0 pcs 5/a1 ucs /once 1 x2 x1 uzi control registers psram control unit mcs 3/rfsh pio unit pio31 pio0* note: * all pio signals are shared with other physical pins. see the pin descriptions beginning on page 24 and table 2 on page 28 for information on shared function. control registers ao15ao8 rfsh 2/aden clkdiv 2
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