RL78/G10 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0384EJ0311 Rev. 3.11 352
Dec 22, 2016
12.5.6 Slave transmission/reception
Slave transmission/reception is that the RL78/G10 transmits/receives data to/from another device in the state of a
transfer clock being input from another device.
3-Wire Serial I/O CSI00 CSI01
Note 1
Target channel Channel 0 of SAU0 Channel 1 of SAU0
Pins used SCK00, SI00, SO00 SCK01, SI01, SO01
Interrupt INTCSI00 INTCSI01
Transfer end interrupt (in single-transfer mode) or buffer empty interrupt (in continuous transfer
mode) can be selected.
Error detection flag Overrun error detection flag (OVF0n) only
Transfer data length 7 or 8 bits
Transfer rate Max. fMCK/6 [Hz]
Notes 2, 3
Data phase
Selectable by the DAP0n bit of the SCR0nH register
• DAP0n = 0: Data output starts at the start of the operation of the serial clock.
• DAP0n = 1: Data output starts half a clock before the start of the serial clock operation.
Clock phase
Selectable by the CKP0n bit of the SCR0nH register
• CKP0n = 0: Non-inversion
• CKP0n = 1: Inverted
Data direction MSB or LSB first
Notes 1. 16-pin products only.
2. Because the external serial clock input to the SCK00 and SCK01 pins is sampled internally and used, the
fastest transfer rate is f
MCK/6 [Hz].
3. Use this operation within a range that satisfies the conditions above and the AC characteristics in the
electrical specifications (see CHAPTER 24 ELECTRICAL SPECIFICATIONS).
Remarks 1. f
MCK: Operation clock frequency of target channel
2. n = 0, 1
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