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RL78/G1A CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 434
Jul 04, 2013
12.5 Operation of 3-Wire Serial I/O (CSI00, CSI01, CSI10, CSI11, CSI20, CSI21) Communication
This is a clocked communication function that uses three lines: serial clock (SCK) and serial data (SI and SO) lines.
[Data transmission/reception]
• Data length of 7 or 8 bits
• Phase control of transmit/receive data
• MSB/LSB first selectable
[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
Note
During master communication: Max. f
CLK/2 (CSI00 only)
Max. fCLK/4
During slave communication: Max. f
MCK/6
[Interrupt function]
• Transfer end interrupt/buffer empty interrupt
[Error detection flag]
• Overrun error
In addition, CSI00 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.
Note Use the clocks within a range satisfying the SCK cycle time (t
KCY) characteristics. For details, see CHAPTER 29
ELECTRICAL SPECIFICATIONS (T
A = −40 to +85°C), CHAPTER 30 ELECTRICAL SPECIFICATIONS (G:
INDUSTRIAL APPLICATIONS TA = −40 to +105°C).
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