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CHAPTER 22 INTERRUPT FUNCTIONS
(1) Interrupt request flag registers (IF0L, IF0H, IF1L)
The interrupt request flag is set to 1 when the corresponding interrupt request is generated or an instruction
is executed. It is cleared to 0 when an instruction is executed upon acknowledgment of an interrupt request
or upon application of RESET input.
IF0L, IF0H, and IF1L are set with a 1-bit or 8-bit memory manipulation instruction. If IF0L and IF0H are used
as a 16-bit register IF0, use a 16-bit memory manipulation instruction for the setting.
RESET input sets these registers to 00H.
Figure 22-2. Interrupt Request Flag Register Format
Note WTIF is test input flag. Vectored interrupt request is not generated.
Cautions 1. TMIF4 flag is R/W enabled only when a watchdog timer is used as an interval timer. If
used in the watchdog timer mode 1, set TMIF4 flag to 0.
2. Set always 0 in IF1L bit 5 and bit 6.
<7>
PIF6
Symbol
IF0L
<6>
PIF5
<5>
PIF4
<4>
PIF3
<3>
PIF2
<2>
PIF1
<1>
PIF0
<0>
TMIF4
Address
FFE0H 00H
After
Reset
R/W
R/W
xxIFx
0
1
Interrupt Request Flag
No interrupt request signal
Interrupt request signal is generated;
Interrupt request state
<7>
TMIF01
IF0H
<6>
TMIF00
<5>
TMIF3
<4>
STIF
<3>
SRIF
<2>
SERIF
<1>
CSIIF1
<0>
CSIIF0
<7>
WTIF
Note
IF1L
6
0
5
0
<4>
TMIF6
<3>
TMIF5
<2>
ADIF
<1>
TMIF2
<0>
TMIF1
FFE1H 00H R/W
FFE2H 00H R/W