LOGIC SYMBOL—Am188™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
8
NMI
AO15–AO8
Address and
AD7–AD0
Address/Data Buses
8
PCS6/A2
PCS5/A1
*
*
*
S6/CLKSEL1
UZI/CLKSEL2
*
*
4
3
PCS3–PCS0
LCS/ONCE0
MCS3/RFSH
MCS2–MCS0
UCS/ONCE1
Memory and
Peripheral Control
ALE
S2
*
*
S1/IMDIS
S0/SREN
HOLD
HLDA
RD
Bus Control
WR
DT/R
DEN
ARDY
*
*
SRDY
*
2
RFSH2/ADEN
WB
DMA Control
DRQ1–DRQ0
*
TMRIN0
*
*
*
*
TXD
RXD
*
*
Asynchronous
Serial Port Control
TMROUT0
TMRIN1
Timer Control
TMROUT1
2
SDEN1–SDEN0
SCLK
32
shared
**
*
*
*
Synchronous
Serial Port Control
Programmable
I/O Control
PIO31–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.
Am186TMER and Am188TMER Microcontrollers Data Sheet
29
AMD [ AMD ]
