NEC PD78058FY(A) - Manual (Page 151)

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CHAPTER 6 PORT FUNCTIONS
KRIF Key Return Signal Detection Flag
0
1
Not Detected
Detected (Falling edge detection of port 4)
0 0 0 0 KRM FFF6H
7 6 5 4 3 2 Symbol 1
0 KRMK KRIF
0
0
KRMK Standby Mode Control by Key Return Signal
0
1
Standby mode release enabled
Standby mode release disabled
Address
After
Reset R/W
02H R/W
(4) Key return mode register (KRM)
This register sets enabling/disabling of standby function release by a key return signal (falling edge detection
of port 4).
KRM is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets KRM to 02H.
Figure 6-22. Key Return Mode Register Format
Caution When falling edge detection of port4 is used, KRIF should be cleared to 0 (not cleared to 0
automatically).