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1-5
Figure 1-2 Am188ER Microcontroller Block Diagram
Notes:
1. All PIO signals are shared with other physical pins. See the pin descriptions in Chapter 3 and
Table 3-1 on page 3-10 for information on shared functions.
20-Bit Source
Pointers
Interrupt
Control Unit
Timer Control
Unit
DMA
Unit
Bus
Interface
Unit
32 Kbyte
RAM
(32K x 8)
Chip-Select
Unit
Clock and
Power
Management
Unit
Control
Registers
16-Bit Count
Registers
Max Count A
Registers
16-Bit Count
Registers
20-Bit Destination
Pointers
Control
Registers
Control
Registers
Control
Registers
01 (WDT)2 0 1
Max Count B
Registers
Refresh
Control
Unit
Control
Registers
Control
Registers
Control
Registers
CLKOUTB
CLKOUTA
INT4
INT3/INTA
1/IRQ
INT2/INTA0
INT1/SELECT
INT0
TMROUT0 TMROUT1
DRQ0 DRQ1
V
CC
GND
TMRIN0 TMRIN1
Asynchronous
Serial Port
Synchronous Serial
Interface
TXD
RXD
SCLK
SDATA
SDEN0 SDEN1
NMI
A19–A0
AD7–AD0
ALE
WR
WB
RD
RES
LCS/ONCE0
MCS
2–MCS0
PCS
6/A2
PCS
3–PCS0
PCS
5/A1
UCS
/ONCE1
X2
X1
Control
Registers
PSRAM
Control
Unit
MCS3/RFSH
PIO
Unit
PIO31–
PIO0
1
Control
Registers
AO15–AO8
RFSH2/ADEN
Execution
Unit
ARDY
SRDY
DT/R
DEN
HOLD
HLDA
S6/
UZI
/
CLKSEL
2
CLKSEL
1
S1/IMDIS
S0/SREN
S2