UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 730

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(1) Interrupt request flag registers (IF0L, IF0H, IF1L, IF1H)
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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 read with a 16-bit memory
manipulation instruction.
Reset signal generation clears these registers to 00H.
Cautions 1. Be sure to set bits 5 to 7 of IF1H to 0.
Address: FFE0H After reset: 00H R/W
Symbol
IF0L
Address: FFE1H
Symbol
IF0H
Address: FFE2H
Symbol
IF1L
Address: FFE3H
Symbol
IF1H
2. When operating a timer, serial interface, or A/D converter after standby release, operate it
Figure 19-2. Format of Interrupt Request Flag Registers (IF0L, IF0H, IF1L, IF1H)
TP1CC1IF
DUALIF5
once after clearing the interrupt request flag. An interrupt request flag may be set by noise.
XXIFX
PIF61
WTIIF
WTIF
<7>
<7>
<7>
7
0
1
0
After reset: 00H
After reset: 00H
After reset: 00H
No interrupt request signal is generated
Interrupt request is generated, interrupt request status
TP1CC0IF
DUALIF3
CSIIF10
ADIF
PIF2
<6>
<6>
<6>
6
0
CHAPTER 19 INTERRUPT FUNCTIONS
R/W
R/W
R/W
Preliminary User’s Manual U19748EJ1V0UD
TP0CC1IF
TP2CC1IF
STIF60
<5>
<5>
<5>
5
0
TP0CC0IF
TP2CC0IF
TP4CC1IF
SRIF60
<4>
<4>
<4>
<4>
Interrupt request flag
TP4CC0IF
DUALIF1
DUALIF4
TP2OVIF
TMIF50
PIF60
PIF3
PIF4
<3>
<3>
<3>
<3>
TP3CC1IF
DUALIF0
C0TRXIF
CSIIF11
IICIF0
PIF1
<2>
<2>
<2>
<2>
TP3CC0IF
C0RECIF
STIF61
PIF0
<1>
<1>
<1>
<1>
C0WUPIF
DUALIF6
TP3OVIF
C0ERRIF
DUALIF2
SRIF61
TMIF51
LVIIF
<0>
<0>
<0>
<0>