SM89516B datasheet(12/49 Pages) SYNCMOS

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SM89516B

8-Bit Micro-controller

64KB Flash

& 1KB RAM embedded

Specifications subject to change without notice contact your sales representatives for the most recent information.

ISSFD-M087

Ver D SM89516B 08/07/2015

- 12 -

Function Description

General Features

SM89516B is an 8-bit micro-controller. All of its functions and the detailed meanings of SFR will be given in the

following sections.

1.1

Embedded Flash

The program can be loaded into the embedded 64KB Flash memory via its writer.

1.2

IO Pads

The SM89516B has Five I/O ports: Port 0, Port 1, Port 2, Port 3, Port 4. Port 0~Port 3 are 8-bit ports. Port 4 is 4-bit

port. These are: quasi-bidirectional (standard 8051 port outputs) with Port 1~4, and open drain with Port 0.

All the pads are with slew rate to reduce EMI. The IO pads can withstand ESD in human body mode guaranteeing

the SM89516B’s quality in high electro-static environments.

1.3

System Control Register (SCONF)

Mnemonic: SCONF

Address: BFh

Reset

WDR

PDWUE

OME

ALEI

02H

WDR: Watch Dog Timer Reset.

When system reset by Watch Dog Timer overflow, WDR will be set to 1.

User should check WDR bit whenever un-predicted reset happened.

PDWUE: Power down wake-up enable bit.

Set 1 to enable wake-up from power-down state by external pin int0 or int1.

OME: On-chip 768B expanded RAM enable bit.

Set 1 to enable on-chip 768B expanded RAM access.

ALEI: ALE output inhibit bit.

When default, It can inhibit the clock signal in (Fosc/6) Hz output to the ALE pin.

When set to 1, the ALE pin output will stop to reduce EMI.

SM89516B 데이터시트(PDF) 12 Page - SyncMOS Technologies,Inc