Datasheet

78K0/Kx2-L CHAPTER 16 SERIAL INTERFACES CSI10 AND CSI11

R01UH0028EJ0400 Rev.4.00 567

Sep 27, 2010

Figure 16-4. Format of Serial Operation Mode Register 10 (CSIM10) (78K0/KB2-L and 78K0/KC2-L)

Address: FF80H After reset: 00H R/W

Note 1

Symbol <7> 6 5 4 3 2 1 0

CSIM10 CSIE10 TRMD10 0 DIR10 0 0 0 CSOT10

CSIE10 Operation control in 3-wire serial I/O mode

0 Disables operation

Note 2

and asynchronously resets the internal circuit

Note 3

1 Enables operation

TRMD10

Note 4

Transmit/receive mode control

Note 5

Receive mode (transmission disabled).

1 Transmit/receive mode

DIR10

Note 6

First bit specification

0 MSB

1 LSB

CSOT10 Communication status flag

0 Communication is stopped.

1 Communication is in progress.

Notes 1. Bit 0 is a read-only bit.

2. To use P10/SCK10 and P12/SO10 as general-purpose ports, set CSIM10 in the default status (00H).

3. Bit 0 (CSOT10) of CSIM10 and serial I/O shift register 10 (SIO10) are reset.

4. Do not rewrite TRMD10 when CSOT10 = 1 (during serial communication).

5. The SO10 output (refer to Figure 16-1) is fixed to the low level when TRMD10 is 0. Reception is started

when data is read from SIO10.

6. Do not rewrite DIR10 when CSOT10 = 1 (during serial communication).

Caution Be sure to clear bit 5 to 0.