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CHAPTER 14 SERIAL INTERFACE SIO3
User’s Manual U15798EJ2V0UD
14.2 Configuration of Serial Interface SIO3
Serial interface SIO3 consists of the following hardware.
Table 14-1. Configuration of Serial Interface SIO3
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.
When “1” is set to bit 7 (CSIE3) of 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 to the serial output (SO3).
When receiving, data is read from the serial input (SI3) and written to SIO3.
SIO3 is set by an 8-bit memory manipulation instruction.
RESET input makes the value of this register undefined.
Caution Do not access SIO3 during a transmit operation unless the access is triggered by a transfer start.
(Read operations are disabled when MODE = 0 and write operations are disabled when MODE
= 1.)
Содержание mPD780344 Series
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