upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 396

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(1) Interrupt request flag registers (IF0L, IF0H, IF1L, IF1H)
396
Cautions 1. Be sure to clear bits 1, 2, 4 to 7 of IF1L and bits 0 to 7 of IF1H to 0.
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.
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 or serial interface after standby release, operate it once after clearing
Figure 13-2. Format of Interrupt Request Flag Registers (IF0L, IF0H, IF1L, IF1H)
the interrupt request flag. An interrupt request flag may be set by noise.
TMIF010
SREIF6
XXIFX
<7>
<7>
7
0
7
0
0
1
After reset: 00H
After reset: 00H
After reset: 00H
No interrupt request signal is generated
Interrupt request is generated, interrupt request status
TMIF000
USBIF1
<6>
<6>
6
0
6
0
CHAPTER 13 INTERRUPT FUNCTIONS
R/W
R/W
R/W
Preliminary User’s Manual U19014EJ1V0UD
USBIF2
TMIF50
<5>
<5>
5
0
5
0
USBIF2
PIF3
<4>
<4>
4
0
4
0
Interrupt request flag
TMIFH1
TMIF51
PIF2
<3>
<3>
<3>
3
0
CSIIF10
PIF1
<2>
<2>
2
0
2
0
STIF6
PIF0
<1>
<1>
1
0
1
0
RSUMIF
SRIF6
LVIIF
<0>
<0>
<0>
0
0