LOGIC SYMBOL—Am186™ER MICROCONTROLLER
X1
X2
RES
INT4
*
*
Clocks
CLKOUTA
INT3/INTA1/IRQ
INT2/INTA0
INT1/SELECT
INT0
Reset Control and
Interrupt Service
CLKOUTB
A19–A0
20
16
*
NMI
AD15–AD0
Address and
Address/Data Buses
S6/CLKSEL1
UZI/CLKSEL2
*
*
PCS6/A2
PCS5/A1
*
*
*
ALE
4
PCS3–PCS0
LCS/ONCE0
MCS3/RFSH
MCS2–MCS0
UCS/ONCE1
S2
Memory and
S1/IMDIS
S0/SREN
HOLD
HLDA
Peripheral Control
*
*
3
RD
WR
Bus Control
DT/R
DEN
*
*
ARDY
SRDY
BHE/ADEN
WHB
WLB
*
2
DMA Control
*
DRQ1–DRQ0
TMRIN0
*
*
TXD
RXD
*
*
Asynchronous
Serial Port Control
TMROUT0
TMRIN1
Timer Control
*
*
TMROUT1
2
SDEN1–SDEN0
SCLK
*
*
*
32
Synchronous
Serial Port Control
shared
Programmable
I/O Control
PIO32–PIO0
**
SDATA
Notes:
* These signals are the normal function of a pin that can be used as a PIO. See the pin descriptions beginning on page 30 and
Table 3 on page 36 for information on shared function.
** All PIO signals are shared with other physical pins.
28
Am186TMER and Am188TMER Microcontrollers Data Sheet