NEC Caution Be sure to set bits 3 through 6 to 1.

503
CHAPTER 21 INTERRUPT AND TEST FUNCTIONS
(1) Interrupt request flag register 1L (IF1L)
It indicates whether a watch timer overflow is detected or not.
It is set by a 1-bit memory manipulation instruction and 8-bit memory manipulation instruction.
It is set to 00H by the RESET signal input.
Figure 21-19. Format of Interrupt Request Flag Register 1L
Caution Be sure to set bits 3 through 6 to 0.
(2) Interrupt mask flag register 1L (MK1L)
It is used to set the standby mode enable/disable at the time the standby mode is released by the watch timer.
It is set by a 1-bit memory manipulation instruction and 8-bit memory manipulation instruction.
It is set to FFH by the RESET signal input.
Figure 21-20. Format of Interrupt Mask Flag Register 1L
Caution Be sure to set bits 3 through 6 to 1.
7
WTMK
Symbol
MK1L
6
1
5
1
4
0
3
0
2
ADMK
1
TMMK2
0
TMMK1
Address
FFE6H FFH
After
Reset R/W
R/W
0
1
Standby Mode Control by Watch Timer
Enables releasing the standby mode.
Disables releasing the standby mode.
WTMK
7
WTIF
Symbol
IF1L
6
0
5
0
4
0
3
0
2
ADIF
1
TMIF2
0
TMIF1
Address
FFE2H 00H
After
Reset R/W
R/W
0
1
Watch Timer Overflow Detection Flag
Not detected
Detected
WTIF