NEC PD750008 - Manual (Page 156)

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µPD750008 USER'S MANUAL
Note The status of the P01/SCK pin is selectable.
Remark (R): Read only
(W): Write only
Serial interface operation enable/disable specification bit (W)
Shift register operation Serial clock counter IRQCSI flag SO/SB0 and SI/SB1 pins
CSIE0 0 Shift operation disabled Cleared Held Used only for port 0
Serial clock selection bit (W)
The P01/SCK pin assumes the following state according to the setting of CSIM0 and CSIM1:
CSIM1 CSIM0 P01/SCK pin state
0 0 High impedance
0 1 High level output
1 0
1 1
When clearing CSIE during serial transfer, use the following procedure:
<1> Disable interrupts by clearing the interrupt enable flag (IECSI).
<2> Clear CSIE.
<3> Clear the interrupt request flag (IRQCSI).
CSIE COI WUP CSIM4 CSIM3 CSIM2 CSIM1 CSIM0
FE0H
CSIM
7 6 5 4 3 2 1 0
Address
Serial clock selection bit (W) Note
Serial interface operation mode selection bit (W)
Wake-up function specification bit (W)
Match signal from address comparator (R)
Serial interface operation enable/disable specification bit (W)