Datasheet

RL78/L12 CHAPTER 12 SERIAL ARRAY UNIT

R01UH0330EJ0200 Rev.2.00 440

Dec 13, 2013

12.5.4 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 CSI00 CSI01

Target channel Channel 0 Channel 1

Pins used SCK00, SO00 SCK01, 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 (OVFmn) only

Transfer data length 7 or 8 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 operation of the serial clock.

• 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: Non-reverse

• CKPmn = 1: Reverse

Data direction MSB or LSB first

Notes 1. 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].

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 (A, G: T

= -40 to +85°C) and CHAPTER 31 ELECTRICAL SPECIFICATIONS (G: T

A = -40 to +105°C)).

Remarks 1. f

MCK: Operation clock frequency of target channel

SCK: Serial clock frequency

2. m: Unit number (m = 0), n: Channel number (n = 0, 1), mn = 00, 01

<R>