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型號(hào)：	PD78F0134M2GB(A)-8EU
廠商：	NEC Corp.
元件分類：	8位微控制器
英文描述：	8-Bit Single-Chip Microcontrollers
中文描述：	8位單芯片微控制器
文件頁(yè)數(shù)：	366/558頁(yè)
文件大?。?/td>	4436K
代理商：	PD78F0134M2GB(A)-8EU

CHAPTER 17 INTERRUPT FUNCTIONS

User’s Manual U16228EJ2V0UD

(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 input.

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 input clears these registers to 00H.

Figure 17-2. Format of Interrupt Request Flag Registers (IF0L, IF0H, IF1L, IF1H)

Address: FFE0H After reset: 00H R/W

Address: FFE1H After reset: 00H R/W

Address: FFE2H After reset: 00H R/W

Address: FFE3H After reset: 00H R/W

Interrupt request flag

No interrupt request signal is generated

Interrupt request is generated, interrupt request status

Be sure to set bits 4 to 7 of IF1H to 0.

PD780133, 780134, 78F0134, 780136, 780138, and 78F0138 only. Be sure to set the

and 780132 to 0.

Cautions 1. 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.

2. If an interrupt request corresponding to a flag of the interrupt request flag register is

generated while the interrupt request flag register is being manipulated (including by 1-bit

memory manipulation), the flag corresponding to the interrupt request may not be set to 1.

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