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(4) Key return mode register (KRM)
The registers are used to set standby mode release enable/disable with the 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
KRM
Caution
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Figure 6-19. Key Return Mode Register Format
7
6
5
4
0
0
0
0
When falling edge detection is used in port 4, be sure to clear KRIF to 0 (KRIF cannot be cleared
to 0 automatically).
CHAPTER 6 PORT FUNCTIONS
3
2
<1>
<0>
0
0
KRMK
KRIF
KRMK
Address
When Reset
R/W
FFF6H
02H
R/W
KRIF
Key Return Signal Detection Flag
0
Undetected
1
Detected (falling edge detection of port 4)
Standby Mode Control with Key Return Signal
0
Standby mode release enable
1
Standby mode release disable
151
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