CHAPTER 14 SERIAL ARRAY UNIT
Page 380 of 920
14.5.4
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.
Note 1.
Because the external serial clock input to the SCK10, SCK21, and SCK30 pins is sampled internally and used, the fastest
transfer rate is f
MCK
/6 [Hz].
Note 2.
Use this operation within a range that satisfies the conditions above and the peripheral functions characteristics in the
electrical specifications (see
ELECTRICAL SPECIFICATIONS
).
Remark
f
MCK
: Operation clock frequency of target channel
3-Wire Serial I/O
CSI10
CSI21
CSI30
Target channel
Channel 2 of SAU0
Channel 1 of SAU1
Channel 2 of SAU1
Pins used
SCK10, SO10
SCK21, SO21
SCK30, SO30
Interrupt
INTCSI10
INTCSI21
INTCSI30
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 [Hz]
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
Summary of Contents for RL78/G1H
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