AM186ES 데이터 시트보기 (PDF) - Advanced Micro Devices

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AM186ES

High Performance, 80C186-/80C188-Compatible and 80L186-/80L188-Compatible, 16-Bit Embedded Microcontrollers

Advanced Micro Devices 

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

11

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