Datasheet

V850ES/JG3 CHAPTER 16 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIB)
R01UH0015EJ0300 Rev.3.00 Page 524 of 870
Sep 30, 2010
(2) Operation timing
(1/2)
SCKBn pin
CBnTSF bit
(1)
(2)
(3)
(4) (5)
(6) (7) (8) (9) (10) (11) (13) (15)(12)
SIBn pin
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SOBn pin
INTCBnT signal
INTCBnR signal
SIBn pin capture
timing
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 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 E3H to the CBnCTL0 register, and select the transmission/reception 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 to the SOBn pin in synchronization with the serial
clock, and capture the receive data of the SIBn pin.
(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 reception of the transfer data length set with the CBnCTL2 register is completed, the reception
completion interrupt request signal (INTCBnR) is generated, and reading of the CBnRX register is enabled.
(9) When a serial clock is input continuously, continuous transmission/reception is started.
(10) Read the CBnRX register.
(11) 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/reception with the current transmission/reception, do not write to the CBnTX register.
Remark n = 0 to 4