Datasheet
78K0/Ix2 CHAPTER 16 SERIAL INTERFACE CSI11
R01UH0010EJ0500 Rev.5.00 551
Feb 28, 2012
(2) Serial I/O shift register 11 (SIO11)
This is an 8-bit register that converts data from parallel data into serial data and vice versa.
This register can be read by an 8-bit memory manipulation instruction.
Reception is started by reading data from SIO11 if bit 6 (TRMD11) of serial operation mode register 11 (CSIM11) is 0.
During reception, the data is read from the serial input pin (SI11) to SIO11.
Reset signal generation clears this register to 00H.
Cautions 1. Do not access SIO11 when CSOT11 = 1 (during serial communication).
2. In the slave mode, reception is started when data is read from SIO11 with a low level input to the
SSI11 pin. For details on the reception operation, refer to 16.4.2 (2) Communication operation.
16.3 Registers Controlling Serial Interface CSI11
Serial interface CSI11 is controlled by the following four registers.
Serial operation mode register 11 (CSIM11)
Serial clock selection register 11 (CSIC11)
Port mode registers 0 and 3 (PM0, PM3)
Port register 3 (P3)
(1) Serial operation mode register 11 (CSIM11)
CSIM11 is used to select the operation mode and enable or disable operation.
CSIM11 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.