TMP86CS49FG datasheet(183/252 Pages) TOSHIBA

183 / 252 page

Page 169

TMP86CS49FG

If received data is not read out from SIO1RDB receive error occurs immediately after shift opera-

tion is finished. Then INTSIO1 interrupt request is generated after SIO1SR<RXERR> is set to “1”.

(3) Stopping the receive operation

There are two ways for stopping the receive operation.

• The way of clearing SIO1CR<SIOS>.

When SIO1CR<SIOS> is cleared to “0”, receive operation is stopped after all of the data is

finished to receive. When receive operation is finished, SIO1SR<SIOF> is cleared to “0”.

In external clock operation, SIO1CR<SIOS> must be cleared to “0” before SIO1SR<SEF> is

set to “1” by starting the next shift operation.

• The way of setting SIO1CR<SIOINH>.

Receive operation is stopped immediately after SIO1CR<SIOINH> is set to “1”. In this case,

SIO1CR<SIOS>, SIO1SR register, SIO1RDB register and SIO1TDB register are initialized.

Figure 14-10 Example of Internal Clock and MSB Receive Mode

A6 A5 A4 A3 A2 A1

B7 B6 B5 B4 B3 B2 B1

C6 C5 C4 C3 C2 C1 C0

Automatic wait

Start shift

operation

Start shift

operation

Start shift

operation

Writing transmit

data A

Writing transmit

data B

Clearing SIOS

Writing transmit

data C

SIO1CR<SIOS>

SIO1SR<SIOF>

SIO1SR<SEF>

SCK1

SI1 pin

SIO1SR<RXF>

INTSIO1

interrupt

request

SIO1RDB

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