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User’s Manual U11969EJ3V0UM00
CHAPTER 8 SERIAL INTERFACE FUNCTION
8.3.7 Transmission/reception in CSI0 to CSI3
Transmission and reception can be executed simultaneously if both transmission and reception are enabled by
the clocked serial interface mode registers (CSIMn) (n = 0 to 3).
(1) Starting transmission/reception
Transmission and reception can be performed simultaneously (transmission/reception operation) when both
the CTXEn and CRXEn bits of the clocked serial interface mode registers (CSIMn) are set to 1.
Transmission/reception can be started by writing the transmit data to the shift register n (SIOn) when both
the CTXEn and CRXEn bits of the CSIMn register are “1” (transmission/reception enabled state)
If CRXEn bit of the CSIMn register has already been set to “1”, writing “1” to this bit does not initiate transmit/
receive operation.
(2) Transmitting data in synchronization with serial clock
(a) When internal clock is selected as serial clock
When transmission/reception is started, the serial clock is output from the SCKn pin, and at the same
time, data is sequentially set to the SOn pin from SIOn in synchronization with the falling edge of the serial
clock. Simultaneously, the data of the SIn pin is sequentially loaded to SIOn in synchronization with the
rising edge of the serial clock.
(b) When external clock is selected as serial clock
When transmission/reception is started, the data is sequentially output from SIOn to the SOn pin in
synchronization with the falling edge of the serial clock input to the SCKn pin immediately after
transmission/reception has been started. The data of the SIn pin is sequentially loaded to SIOn in
synchronization with the rising edge of the serial clock. The shift operation is not performed even if the
serial clock is input to the SCKn pin when transmission/reception is not enabled, and the output level of
the SOn pin does not change.
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