NEC 78K0 Series User Manual page 493

(1) Interrupt request flag registers (IF0L, IF0H, IF1L, IF1H)
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 signal generation.
When an interrupt is acknowledged, the interrupt request flag is automatically cleared and then the interrupt
routine is entered.
IF0L, IF0H, IF1L, and IF1H are set by a 1-bit or 8-bit memory manipulation instruction. When IF0L and IF0H, and
IF1L and IF1H are combined to form 16-bit registers IF0 and IF1, they are set by a 16-bit memory manipulation
instruction.
Reset signal generation sets these registers to 00H.
Figure 19-2. Format of Interrupt Request Flag Registers (IF0L, IF0H, IF1L, IF1H)
Address: FFE0H After reset: 00H R/W
Symbol <7>
IF0L SREIF6
Address: FFE1H After reset: 00H
Symbol <7>
IF0H TMIF010
Address: FFE2H After reset: 00H
Symbol <7>
IF1L PIF7
Address: FFE3H After reset: 00H
Symbol 7
IF1H 0
XXIFX
0
1
µ
Note PD78F0534, 78F0535, 78F0536, 78F0537, and 78F0537D only.
Cautions 1. Be sure to clear bits 1 to 7 of IF1H to 0 for the
to clear bits 4 to 7 of IF1H to 0 for the
78F0537D.
2. 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.
CHAPTER 19 INTERRUPT FUNCTIONS
<6> <5>
PIF5 PIF4
R/W
<6> <5>
TMIF000 TMIF50 TMIFH0
R/W
<6> <5>
PIF6 WTIF
R/W
6 5
0 0
No interrupt request signal is generated
Interrupt request is generated, interrupt request status
Preliminary User's Manual U17260EJ3V1UD
<4> <3> <2>
PIF3 PIF2 PIF1
<4> <3> <2>
TMIFH1 DUALIF0
CSIIF10
STIF0
<4> <3> <2>
KRIF TMIF51 WTIIF
4 <3> <2>
Note
0 TMIF011 TMIF001
Interrupt request flag
µ
PD78F0531, 78F0532, and 78F0533. Be sure
µ
PD78F0534, 78F0535, 78F0536, 78F0537, and
<1> <0>
PIF0 LVIIF
<1> <0>
STIF6 SRIF6
<1> <0>
SRIF0 ADIF
<1> <0>
Note Note
CSIIF11 IICIF0
Note
DMUIF
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