CHAPTER 16 INTERRUPT FUNCTIONS
Preliminary User’s Manual U16315EJ1V0UD
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(1) Interrupt request flag registers (IF0L, IF0H, IF1L)
The interrupt request flags are set to 1 when the corresponding interrupt request is generated or an instruction is
executed. They are cleared to 0 when an instruction is executed upon acknowledgment of an interrupt request or
upon RESET input.
IF0L, IF0H, and IF1L are set by a 1-bit or 8-bit memory manipulation instruction. When IF0L and IF0H are
combined to form 16-bit register IF0, they are set by a 16-bit memory manipulation instruction.
RESET input clears these registers to 00H.
Figure 16-2. Format of Interrupt Request Flag Registers (IF0L, IF0H, IF1L)
Address: FFE0H After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
IF0L
SREIF6
PIF5
PIF4
PIF3
PIF2
PIF1
PIF0
LVIIF
Address: FFE1H After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
IF0H
TMIF010
TMIF000
TMIF50
TMIFH0
TMIFH1
DUALIF0
STIF6
SRIF6
Address: FFE2H After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
IF1L
0
Note
PIF6
WTIF
KRIF
TMIF51
WTIIF
SRIF0
ADIF
XXIFX
Interrupt request flag
0
No interrupt request signal is generated
1
Interrupt request is generated, interrupt request status
Note
Be sure to set bit 7 of IF1L to 0.
Cautions 1. When operating a timer, serial interface, or A/D converter after standby release, operate it
once after clearing the interrupt request flag. An interrupt request flag may be set by noise.
2. When an interrupt is acknowledged, the interrupt request flag is automatically cleared and
then the interrupt routine is entered.