Renesas RL78 Series User Manual page 389

RL78/G1D
13.1 Functions of Serial Array Unit
Each serial interface supported by the RL78/G1D has the following features.
13.1.1 3-wire serial I/O (CSI00, CSI20, CSI21)
Data is transmitted or received in synchronization with the serial clock (SCK) output from the master channel.
3-wire serial communication is clocked communication performed by using three communication lines: one for the serial
clock (SCK), one for transmitting serial data (SO), one for receiving serial data (SI).
For details about the settings, see 13.5 Operation of 3-Wire Serial I/O (CSI00, CSI20, CSI21) Communication.
[Data transmission/reception]
● Data length of 7 or 8 bits
● Phase control of transmit/receive data
● MSB/LSB first selectable
● Level setting of transmit/receive data
[Clock control]
● Master/slave selection
● Phase control of I/O clock
● Setting of transfer period by prescaler and internal counter of each channel
● Maximum transfer rate
During master communication: Max. f
During slave communication:
[Interrupt function]
● Transfer end interrupt/buffer empty interrupt
[Error detection flag]
● Overrun error
In addition, CSI00 supports the SNOOZE mode. When SCK input is detected while in the STOP mode, the SNOOZE
mode makes data reception that does not require the CPU possible.
Notes 1. Use the clocks within a range satisfying the SCK cycle time (t
ELECTRICAL SPECIFICATIONS.
2. CSI21 is supported the functions only described in Table 2-3.
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Note
/2 (CSI00 only)
CLK
Max. f /4
CLK
Max. f /6
MCK
CHAPTER 13 SERIAL ARRAY UNIT
) characteristics (see CHAPTER 30
KCY
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