Am186EM MICROCONTROLLER BLOCK DIAGRAM
INT2/INTA0 INT3/INTA1/IRQ CLKOUTA INT4 INT1/SELECT INT0 NMI TMROUT0 TMRIN0 TMROUT1 DRQ0 DRQ1
CLKOUTB
TMRIN1
X2 X1
Timer Control Unit 0 1 (WDT) 2 Interrupt Control Unit Max Count B Registers Max Count A Registers 16-Bit Count Registers Control Registers
DMA Unit 0 1 20-Bit Source Pointers 20-Bit Destination Pointers 16-Bit Count Registers Control Registers Control Registers
VCC GND
Clock and Power Management Unit
Control Registers
Control Registers
RES
PIO Unit
PIO31– PIO0*
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Control Registers
ARDY SRDY S2–S0 DT/R DEN HOLD HLDA S6/ CLKDIV2 UZI
Refresh Control Unit
PSRAM Control Unit
Control Registers
Control Registers Asynchronous Serial Port
TXD RXD
Bus Interface Unit
Execution Unit
Chip-Select Unit
Control Registers Synchronous Serial Interface
RD WHB A19–A0 AD15–AD0 WR BHE/ADEN ALE WLB LCS/ONCE0 MCS3/RFSH MCS2–MCS0
SCLK PCS6/A2 PCS5/A1 PCS3–PCS0 SDEN0 SDEN1
SDATA
UCS/ONCE1
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.
