RL78/F13, F14 CHAPTER 15 SERIAL ARRAY UNIT
R01UH0368EJ0210 Rev.2.10 928
Dec 10, 2015
15.6.4 Slave transmission
Slave transmission is an operation wherein this MCU transmits data to another device in the state of a transfer clock
being input from another device.
SPI Function CSI00 CSI01 CSI10 CSI11
Target channel Channel 0 of SAU0 Channel 1 of SAU0 Channel 0 of SAU1 Channel 1 of SAU1
Pins used SCK00, SO00, SSI00 SCK01, SO01, SSI01 SCK10, SO10, SSI10 SCK11, SO11, SSI11
Interrupt INTCSI00 INTCSI01 INTCSI10 INTCSI11
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 (OVFmn) only
Transfer data length 7 to 16 bits
Transfer rate Max. fMCK/6 [Hz]
Notes 1, 2
.
Data phase Selectable by the DAPmn bit of the SCRmn register
• DAPmn = 0: Data output starts from the start of the serial clock operation.
• DAPmn = 1: Data output starts half a clock before the start of the serial clock operation.
Clock phase Selectable by the CKPmn bit of the SCRmn register
• CKPmn = 0: Forward
• CKPmn = 1: Reverse
Data direction MSB or LSB first
SPI function The operation of the slave select function can be selected.
Notes 1. Because the external serial clock input to the SCK00, SCK01, SCK10, and SCK11 pins is sampled internally
and used, the fastest transfer rate is f
MCK/6 [Hz].
2. Use this operation within a range that satisfies the conditions above and the AC characteristics in the
electrical specifications.
Remarks 1. f
MCK: Operation clock frequency of target channel
2. m: Unit number (m = 0, 1), n: Channel number (n = 0, 1), mn = 00, 01, 10, 11
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