Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 18 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIF)
R01UH0042EJ0500 Rev.5.00 Page 790 of 1513
Aug 12, 2011
(2) Operation timing
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1Bit 0
SCKFn pin
CFnTSF bit
(1)
(2)
(3)
(4) (5) (6) (7) (8) (9) (11)(10)
SOFn pin
INTCFnT signal
INTCFnR signal
L
Bit 0
(1) Write 00H to the CFnCTL1 register, and select communication type 1, communication clock (fCCLK) =
f
XX/2 or fXX/3, and master mode.
(2) Write 00H to the CFnCTL2 register, and set the transfer data length to 8 bits.
(3) Write C3H to the CFnCTL0 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) Set the CFnSTR.CFnTSF bit to 1 by writing the transmit data to the CFnTX register, and start
transmission.
(5) When transmission is started, output the serial clock to the SCKFn pin, and output the transmit data
from the SOFn pin in synchronization with the serial clock.
(6) When transfer of the transmit data from the CFnTX register to the shift register is completed and
writing to the CFnTX register is enabled, the transmission enable interrupt request signal (INTCFnT) is
generated.
(7) To continue transmission, write the transmit data to the CFnTX register again after the INTCFnT signal
is generated.
(8) When a new transmit data is written to the CFnTX register before communication completion, the next
communication is started following communication completion.
(9) The transfer of the transmit data from the CFnTX register to the shift register is completed and the
INTCFnT signal is generated. To end continuous transmission with the current transmission, do not
write to the CFnTX register.
(10) When the next transmit data is not written to the CFnTX register before transfer completion, stop the
serial clock output to the SCKFn pin after transfer completion, and clear the CFnTSF bit to 0.
(11) To release the transmission enable status, write CFnCTL0.CFnPWR bit = 0 and CFnCTL0.CFnTXE bit
= 0 after checking that the CFnTSF bit = 0.
Caution In continuous transmission mode, the reception completion interrupt request signal
(INTCFnR) is not generated.
Remark n = 0 to 4