Renesas RL78 Series User Manual page 451

16-bit single-chip microcontrollers

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13.5.4 Slave transmission

Slave transmission is that the RL78 microcontroller transmits data to another device in the state of a transfer clock

being input from another device.

3-Wire Serial I/O

Target channel

Error detection flag

Transfer data length

Transfer rate

Data direction

Notes 1. Because the external serial clock input to the SCK00 and SCK20 pins is sampled internally and used, the

fastest transfer rate is f

2. Use this operation within a range that satisfies the conditions above and the peripheral functions

characteristics in the electrical specifications (see CHAPTER 30 ELECTRICAL SPECIFICATIONS).

3. CSI21 cannot be used for slave transmission.

Remarks 1. f

: Operation clock frequency of target channel

: Serial clock frequency

2. m: Unit number (m = 0, 1), n: Channel number (n = 0), mn = 00, 10

R01UH0515EJ0120 Rev.1.20

Dec 16, 2016

Channel 0 of SAU0

Transfer end interrupt (in single-transfer mode) or buffer empty interrupt (in continuous transfer

mode) can be selected.

Overrun error detection flag (OVFmn) only

Selectable by the DAPmn bit of the SCRmn register

● DAPmn = 0: Data output starts from the start of the operation of the serial clock.

● DAPmn = 1: Data output starts half a clock before the start of the serial clock operation.

Selectable by the CKPmn bit of the SCRmn register

● CKPmn = 0: Non-reverse

● CKPmn = 1: Reverse

MSB or LSB first

CHAPTER 13 SERIAL ARRAY UNIT

Channel 0 of SAU1

Channel 1 of SAU1

Rl78/g1d R5f11agg R5f11agh R5f11agj