RL78/G13 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0146EJ0100 Rev.1.00 536
Sep 22, 2011
12.1 Functions of Serial Array Unit
Each serial interface supported by the RL78/G13 has the following features.
12.1.1 3-wire serial I/O (CSI00, CSI01, CSI10, CSI11, CSI20, CSI21, CSI30, CSI31)
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 12.5 Operation of 3-Wire Serial I/O (CSI00, CSI01, CSI10, CSI11, CSI20, CSI21,
CSI30, CSI31) 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 (CSI00): Max. f
CLK/2
Note
During master communication (other than CSI00): Max. fCLK/4
Note
During slave communication: Max. f
MCK/6
Note
[Interrupt function]
• Transfer end interrupt/buffer empty interrupt
[Error detection flag]
• Overrun error
In addition, CSIs of following channels 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. Only following CSIs can be
specified for asynchronous reception.
• 20 to 64-pin products: CSI00
• 80, 100, 128-pin products: CSI00 and CSI20
Note Use the clocks within a range satisfying the SCK cycle time (t
KCY) characteristics (see CHAPTER 29
ELECTRICAL SPECIFICATIONS.
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