Functions Of Serial Array Unit; 3-Wire Serial I/O (Csi00) - Renesas RL78/G1P Hardware User Manual

16-bit single-chip microcontroller

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11.1 Functions of Serial Array Unit

Each serial interface supported by the RL78/G1P has the following features.

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 11.5 Operation of 3-Wire Serial I/O (CSI00) 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: Max. f

[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.

Note Use the clocks within a range satisfying the SCK cycle time (t

ELECTRICAL SPECIFICATIONS).

R01UH0895EJ0100 Rev.1.00

Nov 29, 2019

CHAPTER 11 SERIAL ARRAY UNIT

) characteristics (see CHAPTER 27