Datasheet

V850ES/JG3 CHAPTER 16 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIB)
R01UH0015EJ0300 Rev.3.00 Page 518 of 870
Sep 30, 2010
(2) Operation timing
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SCKBn pin
CBnTSF bit
(1)
(2)
(3)
(4) (5) (6) (7) (8) (9) (11)(10)
SOBn pin
INTCBnT signal
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
(1) Write 07H to the CBnCTL1 register, and select communication type 1, communication clock (f
CCLK) =
external clock (SCKBn), and slave mode.
(2) Write 00H to the CBnCTL2 register, and set the transfer data length to 8 bits.
(3) Write C3H to the CBnCTL0 register, and select the transmission mode, MSB first, and continuous
transfer mode at the same time as enabling the operation of the communication clock (f
CCLK).
(4) The CBnSTR.CBnTSF bit is set to 1 by writing the transmit data to the CBnTX register, and the device
waits for a serial clock input.
(5) When a serial clock is input, output the transmit data from the SOBn pin in synchronization with the
serial clock.
(6) When transfer of the transmit data from the CBnTX register to the shift register is completed and
writing to the CBnTX register is enabled, the transmission enable interrupt request signal (INTCBnT) is
generated.
(7) To continue transmission, write the transmit data to the CBnTX register again after the INTCBnT signal
is generated.
(8) When a serial clock is input following completion of the transmission of the transfer data length set with
the CBnCTL2 register, continuous transmission is started.
(9) When transfer of the transmit data from the CBnTX register to the shift register is completed and
writing to the CBnTX register is enabled, the INTCBnT signal is generated. To end continuous
transmission with the current transmission, do not write to the CBnTX register.
(10) When the clock of the transfer data length set with the CBnCTL2 register is input without writing to the
CBnTX register, clear the CBnTSF bit to 0 to end transmission.
(11) To release the transmission enable status, write the CBnCTL0.CBnPWR bit = 0 and the
CBnCTL0.CBnTXE bit = 0 after checking that the CBnTSF bit = 0.
Caution In continuous transmission mode, the reception completion interrupt request signal
(INTCBnR) is not generated.
Remark n = 0 to 4