SM89516B datasheet(48/49 Pages) SYNCMOS

48 / 49 page

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

- 48 -

only)

RESTART: This bit only set by master mode. The master will send a start signal then send

TWSIA after the ACK signal when this bit setting. If TFIF was set (the NACK

signal was received), the master mode will release, and this bit will clear.

(Master mode only)

MRW: This bit is determined the data transmit direction. And this bit will transmit to

bus as bit0 at Address (Address is collection TWSIA [7:1] and MRW as 8 bits

data). When clear this bit the master is in transmits mode and clear is in

receive mode.

Mnemonic: TWSITXD

Address: C4h

Reset

TXD.7

TXD.6

TXD.5

TXD.4

TXD.3

TXD.2

TXD.1

TXD.0

FFh

The data written into this register will be automatically downloaded to the shift register when the module detects a

calling address is matched and the bit 0 of the received data is one (Slave transmit mode) or when the data in the

shift register has been transmitted with received acknowledge bit (RXAK) =0 in transmit mode.

Mnemonic: TWSIRXD

Address: C5h

Reset

RXD.7

RXD.6

RXD.5

RXD.4

RXD.3

RXD.2

RXD.1

RXD.0

00h

The TWSI Receive Data Buffer (TWSIRXD) contains the last received data when the MATCH flag is one or the

calling address from master when the MATCH flag is zero. The TWSIRXD register will be updated after a data byte

is received and the previous received data had been read out, otherwise the TWSI module will pull down to SCL

line to inhabit the next data transfer. It is a read-only register. The read operation of this register will clear the RXIF

flag. After the RXIF flag is cleared, the register can load the received data again and set the RXIF flag to generate

interrupt request for reading the newly received data.

Mnemonic: IFR

Address: AAh

Reset

TWSIIF

00h

TWSIIF: It is the logic-ORed result of following TWSI flags : RXIF, TXIF, TFIF and

NAKIF. Firmware can poll this bit to check whether TWSI’s flag is set. (Read

only)

SM89516B Datasheet(PDF) 48 Page - SyncMOS Technologies,Inc

SM89516B Datasheet(HTML) 48 Page - SyncMOS Technologies,Inc

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