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Chapter 17
Clocked Serial Interface 3 (CSI3)
User’s Manual U16580EE3V1UD00
<1> When the CSICAEn bit of the CSIM3n register is set to 1, operating clock supply is enabled.
<2> Specify the transfer mode by setting the CSIC3n and CSIL3n registers.
<3> Write 1 to the FPCLRn bit of the SFA3n register to clear all the CSIBUFn pointers to 0.
<4> Confirm that the SFFULn bit = 0, SFEMPn bit = 1, and SFPn3 to SFPn0 bits = 0000 in the SFA3n
register.
<5> Specify the transfer mode by using the TRMDn, DIRn, CSITn, CSWEn, and CSMDn bits of the
CSIM3n register and, at the same time, enable reception by setting the CRXEn bit to 1.
<6> Confirm that the SFFULn bit of the SFA3n register is 0, and then write dummy transfer data to the
SFDB3n register (reception start trigger).
Since the chip select outputs (SCS3n0 to SCS3n3) are ineffective in the slave mode and always
output the inactive level, writing of CS data to the SFCS3n register is not necessary.
If it is clearly known that the SFFULn bit is 0 because dummy transfer data is written to that bit by
the interrupt servicing routine of INTC3n, it is not always necessary to confirm that the SFFULn
bit is 0.
<7> Confirm that the INTC3n interrupt has occurred, and then read the SIRB3n register.
<8> Confirm that the INTC3n interrupt has occurred and the SFEMPn bit is 1, and disable reception
by clearing the CRXEn bit of the CSIM3n register to 0 (end of reception).
Remarks: 1.
To execute a further transfer, repeat <6> and <7> before <8>.
Perform writing dummy transfer data in <6> every time transfer is executed.
2.
The SO3n pin output is fixed to low level (default value).
3.
μ
PD70F3187:
n = 0, 1
μ
PD70F3447:
n = 0
Содержание V850E/PH2
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