Renesas rl78 User Manual

RL78/G1A

CHAPTER 12 SERIAL ARRAY UNIT

R01UH0305EJ0200 Rev.2.00

485

Jul 04, 2013

12.5.6 Slave transmission/reception

Slave transmission/reception is that the RL78 microcontroller 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

CSI10

CSI11

CSI20

CSI21

Target channel

Channel 0 of

SAU0

Channel 1 of

SAU0

Channel 2 of

SAU0

Channel 3 of

SAU0

Channel 0 of

SAU1

Channel 1 of

SAU1

Pins used

SCK00, SI00,

SO00

SCK01, SI01,

SO01

SCK10, SI10,

SO10

SCK11, SI11,

SO11

SCK20, SI20,

SO20

SCK21, SI21,

SO21

INTCSI00 INTCSI01 INTCSI10 INTCSI11 INTCSI20 INTCSI21

Interrupt

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. f

MCK

/6 [MHz]

Notes 1, 2

Data phase

Selectable by the DAPmn bit of the SCRmn register
• DAPmn = 0: Data I/O starts from the start of the operation of the serial clock.
• DAPmn = 1: Data I/O 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, SCK01, SCK10, SCK11, SCK20, and SCK21 pins is

sampled internally and used, the fastest transfer rate is f

MCK

/6 [MHz].

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

characteristic in the electrical specifications (see CHAPTER 29 ELECTRICAL SPECIFICATIONS (T

−40

to +85

°C), CHAPTER 30 ELECTRICAL SPECIFICATIONS (G: INDUSTRIAL APPLICATIONS T

−40 to

+105

°C)).

Remarks 1. f

MCK

: Operation clock frequency of target channel

2. m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3), mn = 00 to 03, 10, 11

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