AM186ES-40VCW datasheet(11/102 Pages) AMD

11 / 102 page

Am186/188ES and Am186/188ESLV Microcontrollers

P R E L IMINAR Y

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

Am 18 6ES micr oco n t r olle r . F i g u r e 2 sh ow s 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.

Figure 2.

80C186 Microcontroller Example System Design

COMPARING THE ES TO THE EMTABLE1

C omp ar ed t o the Am186 EM and Am188 EM

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

UCS

AD15–AD0

ALE

40-MHz

Crystal

Address

Data

Timer 0–2

INT3

DMA 0–1

CLKOUT

20 MHz

SRAM

Address

Data

LCS

BHE

PCS0

LATCH

Serial

Port

RS-232

Level

Converter

INT2–INT0

PIOs

Am29F200

Flash

AM186ES-40VCW 数据表(PDF) 11 Page - Advanced Micro Devices

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