Datasheet

V850ES/JG3 CHAPTER 16 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIB)

R01UH0015EJ0300 Rev.3.00 Page 489 of 870

Sep 30, 2010

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Single transfer mode

Continuous transfer mode

CBnTMS

Note

Transfer mode specification

[In single transfer mode]

The reception complete interrupt request signal (INTCBnR) is generated.

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

request signal (INTCBnT) is not generated.

If the next transmit data is written during communication (CBnSTR.CBnTSF bit =

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

communication is set (CBnTXE bit = 0, CBnRXE bit = 1), the next communication

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

CBbTSF bit = 1).

[In continuous transfer mode]

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

communication (CBnSTR.CBnTSF bit = 1). Writing the next transmission data is

enabled after a transmission enable interrupt (INTCBnT) occurrence.

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

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

reception complete interrupt (INTCBnR) regardless of the read operation of the

CBnRX register.

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

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

CBnDIR

Note

Specification of transfer direction mode (MSB/LSB)

MSB-first transfer

LSB-first transfer

Note These bits can only be rewritten when the CBnPWR bit = 0.

However, CBnPWR bit = 1 can also be set at the same time as rewriting these bits.