AM186ER-25 Просмотр технического описания (PDF) - Advanced Micro Devices

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AM186ER-25

High-Performance, 80C186- and 80C188-Compatible, 16-Bit Embedded Microcontrollers with RAM

Advanced Micro Devices 

Direct Memory Interface Example

Figure 1 illustrates the direct interface to memory of the

Am186ER microcontroller. The A19–A0 bus connects

to the memory address inputs, the AD bus connects to

the data inputs and outputs, and the chip selects con-

nect to the memory chip-select inputs.

Figure 1 also shows an implementation of an RS-232

console or modem communications port. The RS-232-

to-CMOS voltage-level converter is required for the

electrical interface with the external device.

12.5-MHz

Crystal

Am186ER

Microcontroller

X2

WR

A19–A0

X1 AD15–AD0

RD

UCS

32 Kbyte

SRAM

Am29F400

Flash

WE

Address

Data

OE

CS

COMPARISON OF THE Am186™ER AND

80C186 MICROCONTROLLERS

Serial Port

Timer 0–2

INT4–INT0

Figure 1 shows an example system using a 50-MHz

Am186ER microcontroller. Figure 2 shows a compara-

ble system implementation with an 80C186 microcon-

RS-232

Level

Converter

TXD

RXD

DMA 0–1

CLKOUTA

50 MHz

troller. Because of its superior integration, the

Am186ER system does not require the support devices

required on the 80C186 example system. In addition,

the Am186ER microcontroller provides significantly

better performance with its 50-MHz clock rate.

Figure 1. Am186™ER 50-MHz Example

System Design

T 40-MHz

D R A F Crystal

X2

BHE

A0

X1

WR

ALE

AD15–AD0

RD

UCS

LCS

PCS0

Timer 0–2

Am29F400

Flash

WE

Address

Data

OE

CS

LATCH

PIOs

Serial

Port

SRAM

WE

WE

Address

Data

OE

CS

RS-232

Level

Converter

INT3

INT2–INT0

DMA 0–1

CLKOUT

20 MHz

Figure 2. Typical 80C186 System Design

Am186TMER and Am188TMER Microcontrollers Data Sheet

15

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