CHAPTER 14 SERIAL ARRAY UNIT
Page 394 of 920
14.5.6
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.
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, SI10, SO10
SCK21, SI21, SO21
SCK30, SI30, 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 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
Summary of Contents for RL78/G1H
Page 941: ...R01UH0575EJ0120 RL78 G1H...
