SM89516B datasheet(46/49 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

- 46 -

13. Two-Wire Series Interface (TWSI)

Two Wire Serial Interface, is a serial interface in SM89516B, that is function compatible with IIC 400kps

specification and is capable to communicate with standard IIC devices via configuring SM89516B as one of IIC

device types - master transmitter, master receiver, slave transmitter or slave receiver device.

Mnemonic

Description

Dir.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RST

TWSI

P1CON

P1 Control

9BH

SDAE

SCLE

PWM1

PWM0

00H

TWSIS

TWSI Status

C0H

RXIF

TXIF

TFAIL

NAKIF

RXACK

MST

TXACK

00H

TWSIA

TWSI Address

C1H

ADR.6

ADR.5

ADR.4

ADR.3

ADR.2

ADR.1

ADR.0

ADR

A0H

TWSIC1

TWSIC Control

C2H

TWSIE

Bus

Busy

TWSIF

01H

TWSIC2

TWSIC Control

C3H

MATC

SRW

RESTA

MRW

00H

TWSITXD

TWSI TX Data

C4H

TXD.7

TXD.6

TXD.5

TXD.4

TXD.3

TXD.2

TXD.1

TXD.0

FFH

TWSIRXD

TWSI RX Data

C5H

RXD.7

RXD.6

RXD.5

RXD.4

RXD.3

RXD.2

RXD.1

RXD.0

00H

IFR

Interrupt Flag

AAH

TWSIIF

00H

Mnemonic: P1CON

Address: 9Bh

Reset

SDAE

SCLE

PWM1E

PWM0E

00h

SDAE: Set 1 to configure P1[7] as SDA pin of TWSI.

SCLE: Set 1 to configure P1[6] as SCL pin of TWSI.

Mnemonic: TWSIS

Address: C0h

Reset

RXIF

TXIF

TFAIL

NAKIF

RXACK

MST

TXACK

00h

RXIF: TWSI interrupt flag for data receiving. It is set after the TWSI RXD (Receive

Data Buffer) is loaded with new received data.

TXIF: TWSI interrupt flag for data transmitting. It is set when the data of TWSI TXD

(Transmit Data Buffer) is downloaded onto the shift register or the TWSIA is

downloaded onto the shift register at Master Transmit mode.

TFAIL: This flag is set when the data transmit is failed. (Master mode only)

NAKIF: Non-acknowledge interrupt flag. It is only set in the master mode when there is

no acknowledge bit detected after one byte data or calling address is

transferred.

RXACK: The acknowledge status indicator. When clear, it means an acknowledge

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