P R E L I M I N A R Y
Am186EM MICROCONTROLLER BLOCK DIAGRAM
INT2/INTA0
INT3/INTA1/IRQ
CLKOUTA
INT1/SELECT
TMROUT0
TMROUT1
INT4
INT0
NMI
TMRIN0 TMRIN1
DRQ0
DRQ1
CLKOUTB
DMA
Unit
Timer Control
Unit
X2
X1
0
1 (WDT)
2
0
1
Clock and
Power
Management
Unit
Max Count B
Registers
20-Bit Source
Pointers
20-Bit Destination
Pointers
Interrupt
Control Unit
V
Max Count A
CC
Registers
16-Bit Count
Registers
Control
16-Bit Count
Registers
GND
Control
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
TXD
RXD
Asynchronous
Serial Port
S2–S0
DT/R
DEN
Bus
Interface
Unit
Chip-Select
Unit
Control
Registers
Execution
Unit
HOLD
HLDA
Synchronous Serial
Interface
S6/
CLKDIV2
UZI
RD
WHB
WLB
WR
BHE/ADEN
SDATA
PCS6/A2 SDEN0 SDEN1
PCS5/A1
PCS3–PCS0
UCS/ONCE1
SCLK
LCS/ONCE0
MCS3/RFSH
MCS2–MCS0
A19–A0
AD15–AD0
ALE
Note:
* All PIO signals are shared with other physical pins. See the pin descriptions beginning on page 25 and Table 2 on page 30 for
information on shared functions.
2
Am186/188EM and Am186/188EMLV Microcontrollers
AMD [ AMD ]
