AM188ES-40KCW Datasheet, PDF (11/102 Pages) Advanced Micro Devices – High Performance, 80C186-/80C188-Compatible and 80L186-/80L188-Compatible, 16-Bit Embedded Microcontrollers

PRELIMINARY
connects to the data inputs and outputs, and the chip
selects connect to the memory chip-select inputs.
The RD output connects to the SRAM Output Enable
(OE) pin for read operations. Write operations use the
byte-write enables connected to the SRAM Write
Enable (WE) pins.
The example design uses 2-Mbit memory technology
(256 Kbytes) to fully populate the available address
space. Two flash PROM devices provide 512 Kbytes of
nonvolatile program storage, and two static RAM
devices provide 512 Kbytes of data storage area.
COMPARING THE ES TO THE 80C186
Figure 1 shows an example system using a 40-MHz
Am186ES microcontroller. Figure 2 shows a
comparable system implementation with an 80C186.
Because of its superior integration, the Am186ES
microcontroller system does not require the support
devices that are required on the 80C186 example
system. In addition, the Am186ES microcontroller
provides significantly better performance with its 40-
MHz clock rate.
40-MHz
Crystal
X2
BHE
A0
X1
WR
ALE
AD15–AD0
RD
UCS
LCS
PCS0
Timer 0–2
INT3
INT2–INT0
DMA 0–1
CLKOUT
Am29F200
Flash
WE
Address
Data
OE
CS
LATCH
PIOs
Serial
Port
SRAM
WE
WE
Address
Data
OE
CS
RS-232
Level
Converter
20 MHz
Figure 2. 80C186 Microcontroller Example System Design
COMPARING THE ES TO THE EMTABLE1
Compared to the Am186EM and Am188EM
microcontrollers, the Am186ES and Am188ES
microcontrollers have the following additional features:
n Two full-featured asynchronous serial ports
n The ability to use DMA to and from the serial ports
n Two additional external interrupt signals
n Enhancements to the watchdog timer to improve its
security and functionality
n A pulse width demodulation option
n A data strobe bus interface option for DEN
n ARDY functionality is changed to allow both edges
of ARDY to be asynchronous to the clock
n An option to have all MCS space asserted through
MCS0
n On the Am186ES microcontroller, static bus sizing
allows UCS space to use a 16-bit data bus, while
LCS space can be either 8-bit or 16-bit. All non-
UCS and non-LCS memory and I/O accesses can
be 8-bit or 16-bit. This capability is available only on
the Am186ES microcontroller; the Am188ES micro-
controller has a uniform 8-bit access width.
n The synchronous serial interface is removed
n On the ES, row addresses are not driven on DRAM
refreshes
Two Asynchronous Serial Ports
The Am186ES and Am188ES microcontrollers have
two identical asynchronous serial ports. Each serial
Am186/188ES and Am186/188ESLV Microcontrollers
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