upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 326

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(1) Interrupt request flag registers (IF0L, IF0H, IF1L)
326
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.
When an interrupt is acknowledged, the interrupt request flag is automatically cleared and then the interrupt
routine is entered.
IF0L, IF0H, and IF1L can be set by a 1-bit or 8-bit memory manipulation instruction. When IF0L and IF0H are
combined to form 16-bit register IF0, they can be set by a 16-bit memory manipulation instruction.
RESET input clears these registers to 00H.
Cautions 1. Be sure to clear bit 7 of IF1L to 0.
Address: FFE0H After reset: 00H R/W
Symbol
IF0L
Address: FFE1H
Symbol
IF0H
Address: FFE2H
Symbol
IF1L
2. When operating a timer, serial interface, or A/D converter after standby release, operate it
TMIF010
once after clearing the interrupt request flag. An interrupt request flag may be set by noise.
SREIF6
Figure 16-2. Format of Interrupt Request Flag Registers (IF0L, IF0H, IF1L)
XXIFX
<7>
<7>
7
0
0
1
After reset: 00H
After reset: 00H
No interrupt request signal is generated
Interrupt request is generated, interrupt request status
TMIF000
PIF5
PIF6
<6>
<6>
<6>
CHAPTER 16 INTERRUPT FUNCTIONS
R/W
R/W
TMIF50
WTIF
PIF4
<5>
<5>
<5>
User’s Manual U16962EJ3V0UD
TMIFH0
KRIF
PIF3
<4>
<4>
<4>
Interrupt request flag
TMIFH1
TMIF51
PIF2
<3>
<3>
<3>
DUALIF0
WTIIF
PIF1
<2>
<2>
<2>
SRIF0
STIF6
PIF0
<1>
<1>
<1>
SRIF6
LVIIF
ADIF
<0>
<0>
<0>