Key Return Mode Register Format - NEC PD78052 User Manual

(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.
Symbol 7 6 5
KRM 0 0 0
Caution When falling edge detection of port4 is used, KRIF should be cleared to 0 (not cleared to 0
automatically).
CHAPTER 6 PORT FUNCTIONS
Figure 6-22. Key Return Mode Register Format
4 3 2 <1> <0>
0 0 0 KRMK KRIF
After
Address Reset
FFF6H 02H
Key Return Signal Detection Flag
KRIF
0 Not Detected
1 Detected (Falling edge detection of port 4)
KRMK Standby Mode Control by Key Return Signal
0 Standby mode release enabled
1 Standby mode release disabled
R/W
R/W
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