NEC PD75402A - Manual (Page 97)

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CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
Signal from address comparator (R)
Clearing Conditions (COI = 0) Setting Condition (COI = 1)
When slave address register (SVA) and
shift register data do not match.
COI*
When slave address register (SVA) and shift
register data match.
Shift Register
Operation
Serial Clock
Counter
IRQCSI Flag SO/SB0 & SI Pins
Shift operation
enabled
1 CSIE Count operation Settable
Function in each
mode plus port 0
function
* A CIO read is valid only before the start of after completion of a serial transfer. During a transfer an indeterminate
value will be read.
Also, COI data written by an 8-bit manipulation instruction is ignored.
Serial interface operation enable/disable specification bit (W)