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CHAPTER 15 SERIAL INTERFACE (SIO30)
Preliminary User’s Manual U13420EJ2V0UM00
(2) Communication operations
In 2-wire serial I/O mode, data is transmitted and received in 8-bit units. Each bit of data is sent or received in
synchronization with the serial clock.
Serial I/O shift register 30 (SIO30) is shifted in synchronization with the falling edge of the serial clock.
Transmission data is held in the SDIO30 latch and is output from the SDIO30 pin. Data that is received via the
SDIO30 pin in synchronization with the rising edge of the serial clock is latched to SIO30.
Completion of an 8-bit transfer automatically stops operation of SIO30 and sets interrupt request flag (CSIIF30).
Figure 15-3. Timing of 2-Wire Serial I/O Mode
(3) Transfer start
Serial transfer starts when the following two conditions have been satisfied and transfer data has been set (or
read) to serial I/O shift register 30 (SIO30).
• SIO30 operation control bit (CSIE30) = 1
• After an 8-bit serial transfer, either the internal serial clock is stopped or SCK30 is set to high level.
• Transmit mode
When CSIE30 = 1 and MODE0 = 0, transfer starts when writing to SIO30.
• Receive mode
When CSIE30 = 1 and MODE0 = 1, transfer starts when reading from SIO30.
Caution
After data has been written to SIO30, transfer will not start even if the CSIE30 bit value is set
to “1”.
Completion of an 8-bit transfer automatically stops the serial transfer operation and interrupt request flag
(CSIIF30) is set.
CSIIF30
SCK30
1
SDIO30
D7
D6
D5
D4
D3
D2
D1
D0
2
3
4
5
6
7
8
Transfer completion
Transfer starts in synchronization with the SCK30 falling edge
Содержание mPD780065 Series
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