TMP86CS44UG datasheet(119/172 Pages) TOSHIBA

119 / 172 page

Page 109

TMP86CS44UG

Note 1: The operation error flag (TXERR and RXERR) are not automatically cleared by stopping transfer with SIOCR1<SIOS>

"0". Therefore, set these bits to "0" for clearing these error flag. Or set SIOCR1<SIOINH> to "1".

Note 2: *: Don't care

Note 1: SIOTDB is write only register. A bit manipulation should not be performed on the transmit buffer register using a read-

modify-write instruction.

Note 2: The SIOTDB should be written after checking SIOSR<TXF> "1". When SIOSR<TXF> is "0", the writing data can't be

transferred to SIOTDB even if write instruction is executed to SIOTDB

Note 3: *: Don't care

Serial Interface Status Register

SIOSR

(0027H)

765

SIOF

SEF

TXF

RXF

TXERR

RXERR

(Initial value: 0010 00**)

SIOF

Serial transfer operation status

monitor

0: Transfer finished

1: Transfer in progress

Read

only

SEF

Number of clocks monitor

0: 8 clocks

1: 1 to 7 clocks

TXF

Transmit buffer empty flag

0: Data exists in transmit buffer

1: No data exists in transmit buffer

RXF

Receive buffer full flag

0: No data exists in receive buffer

1: Data exists in receive buffer

TXERR

Transfer operation error flag

Read

0: – (No error exist)

1: Transmit buffer under run occurs in an external clock mode

Write

0: Clear the flag

1: – (A write of "1" to this bit is ignored)

R/W

RXERR

Receive operation error flag

Read

0: – (No error exist)

1: Receive buffer over run occurs in an external clock mode

Write

0: Clear the flag

1: – (A write of "1" to this bit is ignored)

Receive buffer register

SIORDB

(0028H)

765

Read only

(Initial value: 0000 0000)

Transmit buffer register

SIOTDB

(0028H)

765

Write only

(Initial value: **** ****)

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