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CHAPTER 15 SERIAL INTERFACE SIO3
Preliminary User’s Manual U14581EJ3V0UM00
15.2 Serial Interface Configuration
The serial interface SIO3 consists of the following hardware.
Table 15-1. Serial Interface SIO3 Configuration
Item
Configuration
Register
Serial I/O shift register 3 (SIO3)
Control register
Serial operation mode register 3 (CSIM3)
(1) Serial I/O shift register 3 (SIO3)
This is an 8-bit register that performs parallel-serial conversion and serial transmit/receive (shift operations)
synchronized with the serial clock.
SIO3 is set with an 8-bit memory manipulation instruction.
When “1” is set to bit 7 (CSIE3) of the serial operation mode register 3 (CSIM3), a serial operation can be started
by writing data to or reading data from SIO3.
When transmitting, data written to SIO3 is output via the serial output (SO3).
When receiving, data is read from the serial input (SI3) and written to SIO3.
RESET input clears SIO3 to 00H.
Caution
Do not access SIO3 during a transfer operation unless the access is triggered by a transfer
start (Read is disabled when MODE3 = 0 and write is disabled when MODE3 = 1).
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