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CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
452
(1) Interrupt request flag registers (IF0L, IF0H)
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 and IF0H are set with a 1-bit or 8-bit memory manipulation instruction. When IF0L and IF0H are used together
as a 16-bit register IF0, they are set with a 16-bit memory manipulation instruction.
RESET input sets these registers to 00H.
Figure 18-2. Interrupt Request Flag Register Format
Symbol
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
Address
When Reset
R/W
IF0L
TMIF3 CSIIF1 CSIIF0
PIF3
PIF2
PIF1
PIF0
TMIF4
FFE0H
00H
R/W
7
6
<5>
4
<3>
<2>
<1>
<0>
IF0H
0
0
WTIF
Note
0
ADIF
TMIF2
TMIF1
TMIF0
FFE1H
00H
R/W
××
IF
Interrupt Request Flag
0
No interrupt request signal is generated
1
Interrupt request signal is generated and
interrupt requested
Note
WTIF flag is a 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 a watchdog
timer mode 1 is used, set TMIF4 flag to 0.
2. Be sure to set bits 4, 6, and 7 of IF0H to 0.
Содержание 78014Y Series
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