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CHAPTER 11 SERIAL INTERFACES SIO30 TO SIO32
User’s Manual U15104EJ2V0UD
11.2 Configuration of Serial Interfaces SIO30 to SIO32
The serial interface SIO3n consists of the following hardware.
Table 11-1. Configuration of Serial Interfaces SIO30 to SIO32
Item
Configuration
Register
Serial I/O shift registers 30 to 32 (SIO30 to SIO32)
Control registers
Serial operating mode registers 30 to 32 (CSIM30 to CSIM32)
Serial port select register 32 (SIO32SEL)
(1) Serial I/O shift registers 30 to 32 (SIO30 to SIO32)
These 8-bit registers convert parallel data into serial data and transmit or receive the serial data (shift
operation) in synchronization with a serial clock.
SIO3n is set with an 8-bit memory manipulation instruction.
Serial operation is started by writing or reading data to or from SIO3n when bit 7 (CSIE3n) of serial operating
mode register 3n (CSIM3n) is 1.
Data written to SIO3n is output to a serial output line (SO3n) for transmission.
Data is read to SIO3n from a serial input line (SI3n) for reception.
Reset input makes the values of these registers undefined.
Caution
Do not execute access other than that for the transfer start trigger to SIO3n during a transfer
operation (the read operation is disabled when MODE3n = 0, and the write operation is
disabled when MODE3n = 1).
Remark
n = 0 to 2
Содержание mPD178053
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