P R E L I M I N A R Y
Am186ES MICROCONTROLLER BLOCK DIAGRAM
INT2/INTA0**
INT3/INTA1/IRQ
INT6–INT4**
INT1/SELECT
INT0
CLKOUTA
TMROUT0 TMROUT1
PWD**
TMRIN0
TMRIN1
DRQ0** DRQ1**
CLKOUTB
NMI
Timer Control
Unit
DMA
Unit
X2
X1
Pulse
0
1
Max Count B
Registers
2
0
1
Width
Demod-
ulator
Clock and
Power
Management
Unit
V
CC
20-Bit Source
Pointers
20-Bit Destination
Interrupt
Control Unit
GND
Max Count A
Registers
(PWD)
Pointers
Watchdog
16-Bit Count
16-Bit Count
Timer (WDT)
Control
Registers
Control
Registers
Control
Control
Registers
Registers
Registers
Registers
PIO
Unit
PIO31–
PIO0*
RES
Control
Registers
Control
Registers
Control
Registers
Refresh
Control
Unit
PSRAM
Control
Unit
ARDY
SRDY
S2–S0
DT/R
TXD0
RXD0
Asynchronous
Serial Port 0
RTS0/RTR0
CTS0/ENRX0
Bus
Interface
Unit
Chip-Select
Unit
Execution
Unit
DEN/DS
HOLD
TXD1
RXD1
Asynchronous
Serial Port 1
HLDA
S6/LOCK/
CLKDIV2
UZI
RTS1/RTR1**
CTS1/ENRX1**
RD
WHB
WLB
LCS/ONCE0
PCS6/A2
A19–A0
AD15–AD0
PCS5/A1
PCS3–PCS0**
MCS3/RFSH
MCS2–MCS0
WR
BHE/ADEN
UCS/ONCE1
ALE
Notes:
*All PIO signals are shared with other physical pins. See the pin descriptions beginning on page 27 and Table 2 on page 34 for
information on shared functions.
** PWD, INT5, INT6, RTS1/RTR1, and CTS1/ENRX1 are multiplexed with INT2/INTA0, DRQ0, DRQ1, PCS3, and PCS2 respec-
tively. See the pin descriptions beginning on page 27.
2
Am186/188ES and Am186/188ESLV Microcontrollers
AMD [ AMD ]
