AM186 datasheet(15/112 Pages) AMD

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Am186TMER and Am188TMER Microcontrollers Data Sheet

DRAF

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.

COMPARISON OF THE Am186™ER AND

80C186 MICROCONTROLLERS

Figure 1 shows an example system using a 50-MHz

Am186ER microcontroller. Figure 2 shows a compara-

ble system implementation with an 80C186 microcon-

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

Figure 2.

Typical 80C186 System Design

RS-232

Level

Converter

TXD

RXD

UCS

AD15–AD0

A19–A0

Serial Port

Am186ER

Microcontroller

12.5-MHz

Crystal

Address

Data

32 Kbyte

SRAM

Timer 0–2

INT4–INT0

DMA 0–1

CLKOUTA

50 MHz

Am29F400

Flash

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

Am29F400

Flash

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