721
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 transmission by setting the CTXEn bit to 1.
<6> Confirm that the SFFULn bit of the SFA3n register is 0, and then write transfer data to the
SFDB3n register.
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 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 the SFEMPn bit is 1, and disable
transmission by clearing the CTXEn bit of the CSIM3n register to 0 (end of transmission).
Remarks: 1.
To execute a further transfer, repeat <6> before <7>.
2.
μ
PD70F3187:
n = 0, 1
μ
PD70F3447:
n = 0
Содержание MuPD70F3187
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