Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 18 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIF)

R01UH0042EJ0500 Rev.5.00 Page 770 of 1513

Aug 12, 2011

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Single transfer mode

Continuous transfer mode

CFnTMS

Note

Transfer mode specification

[In single transfer mode]

The reception completion interrupt (INTCFnR) occurs when communication is

complete.

Even if transmission is enabled (CFnTXE bit = 1), the transmission enable interrupt

(INTCFnT) does not occur.

If the next transmit data is written during communication (CFnSTR.CFnTSF bit =

1), it is ignored and the next communication is not started. Also, if reception-only

communication is set (CFnTXE bit = 0, CFnRXE bit = 1), the next communication

is not started even if the receive data is read during communication (CFnSTR.

CFnTSF bit = 1).

[In continuous transfer mode]

The continuous transmission is enabled by writing the next transmit data during

communication (CFnSTR.CFnTSF bit = 1).

Writing the next transmission data is enabled after a transmission enable interrupt

(INTCFnT) occurs.

If reception-only communication is set (CFnTXE bit = 0, CFnRXE bit = 1) in the

continuous transfer mode, the next reception is started immediately after a

reception completion interrupt (INTCFnR), regardless of the read operation of the

CFnRX register.

Therefore, immediately read the receive data from the CFnRX register. If this read

operation is delayed, an overrun error (CFnOVE bit = 1) occurs.

CFnDIR

Note

Specification of transfer direction mode (MSB/LSB)

MSB-first transfer

LSB-first transfer

Note These bits can only be rewritten when the CFnPWR bit = 0. However, the CFnPWR

can be set to 1 at the same time as these bits are rewritten.