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16.2 Serial Interface (SIO31) Configuration
The serial interface (SIO31) includes the following hardware.
Item
Registers
Control registers
(1) Serial I/O shift register 31 (SIO31)
This is an 8-bit register that performs parallel-serial conversion and serial transmit/receive (shift operations)
synchronized with the serial clock.
SIO31 is set by an 8-bit memory manipulation instruction.
When "1" is set to bit 7 (CSIE31) of the serial operation mode register 31 (CSIM31), a serial operation can be
started by writing data to or reading data from SIO31.
When transmitting, data written to SIO31 is output to the serial output (SO31).
When receiving, data is read from the serial input (SI31) and written to SIO31.
RESET input resets SIO31 to 00H.
Caution
Do not access SIO31 during a transmit operation unless the access is triggered by a transfer
start. (Read operation is disabled when MODE0 = 0 and write operation is disabled when
MODE0 = 1.)
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CHAPTER 16 SERIAL INTERFACE (SIO31)
Table 16-1. Serial Interface (SIO31) Configuration
Serial I/O shift register 31 (SIO31)
Serial operation mode register 31 (CSIM31)
Preliminary User's Manual U13420EJ2V0UM00
Configuration
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