TMP86CS44UG datasheet(129/172 Pages) TOSHIBA

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TMP86CS44UG

Figure 11-12 Example of Receive Error Processing

Note: If receive error is not corrected, an interrupt request does not generate after the error occurs.

11.3.3.3 Transmit/receive mode

The transmit/receive mode are selected by writing “10” to SIOCR1<SIOM>.

(1) Starting the transmit/receive operation

Transmit/receive mode is selected by writing “10B” to SIOCR1<SIOM>. Serial clock is selected

by using SIOCR1<SCK>. Transfer direction is selected by using SIOCR1<SIODIR>.

When a transmit data is written to the transmit buffer register (SIOTDB), SIOSR<TXF> is cleared

to “0”.

After SIOCR1<SIOS> is set to “1”, SIOSR<SIOF> is set synchronously to the falling edge of SCK

pin.

The data is transferred sequentially starting from SO pin with the direction of the bit specified by

SIOCR1<SIODIR>, synchronizing with the SCK pin's falling edge. And receiving operation also

starts with the direction of the bit specified by SIOCR1<SIODIR>, synchronizing with the SCK pin's

rising edge.

SIOSR<SEF> is kept in high level between the first clock falling edge of SCK pin and eighth clock

falling edge.

SIOSR<TXF> is set to “1” at the rising edge of SCK pin after the data written to the SIOTDB is

transferred to shift register. When 8-bit data has been received, the received data is transferred to

SIORDB from shift register, then the INTSIO interrupt request occurs, synchronizing with setting

SIOSR<RXF> to “1”.

Note 1: In internal clock operation, when the SIOCR1<SIOS> is set to "1", SIOTDB is transferred to shift

pin.

Note 2: In external clock operation, when the falling edge is input from SCK pin after SIOCR1<SIOS> is

set to "1", SIOTDB is transferred to shift register immediately. When the rising edge is input from

SCK

pin, receive operation also starts.

Writing transmit

data B

Writing transmit

data A

A7 A6

A5 A4 A3 A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0 C7 C6 C5 C4 C3 C2 C1 C0

Start shift

operation

Start shift

operation

Start shift

operation

Write a "0" after reading the

received data when a receive

error occurs.

SIOCR1<SIOS>

SIOSR<SEF>

SCK

SIOSR<RXERR>

INTSIO

interrupt

request

SIORDB

SI pin

SIOSR<SIOF>

SIOSR<RXF>

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