PIC12F635ESLASHSS datasheet(26/196 Pages) MICROCHIP

26 / 196 page

PIC12F635/PIC16F636/639

DS41232B-page 24

Preliminary

2.2.2.5

PIR1 Register

The PIR1 register contains the interrupt flag bits, as

shown in Register 2-5.

PIR1 – PERIPHERAL INTERRUPT REQUEST REGISTER 1 (ADDRESS: 0Ch)

Note:

Interrupt flag bits are set when an interrupt

condition occurs, regardless of the state of

its corresponding enable bit or the Global

Interrupt Enable bit, GIE (INTCON<7>).

User

software

should

ensure

the

appropriate interrupt flag bits are clear

prior to enabling an interrupt.

R/W-0

U-0

R/W-0

EEIF

LVDIF

CRIF

C2IF(1)

C1IF

OSFIF

—TMR1IF

bit 7

bit 0

bit 7

EEIF: EEPROM Write Operation Interrupt Flag bit

= The write operation completed (must be cleared in software)

= The write operation has not completed or has not been started

bit 6

LVDIF: Low-Voltage Detect Interrupt Flag bit

= The supply voltage has crossed selected LVD voltage (must be cleared in software)

= The supply voltage has not crossed selected LVD voltage

bit 5

CRIF: Cryptographic Interrupt Flag bit

= The Cryptographic module has completed an operation (must be cleared in software)

= The Cryptographic module has not completed an operation or is Idle

bit 4

C2IF: Comparator 2 Interrupt Flag bit(1)

= Comparator output (C2OUT bit) has changed (must be cleared in software)

= Comparator output (C2OUT bit) has not changed

bit 3

C1IF: Comparator 1 Interrupt Flag bit

= Comparator output (C1OUT bit) has changed (must be cleared in software)

= Comparator output (C1OUT bit) has not changed

bit 2

OSFIF: Oscillator Fail Interrupt Flag bit

= System oscillator failed, clock input has changed INTOSC (must be cleared in software)

= System clock operating

bit 1

Unimplemented: Read as ‘0’

bit 0

TMR1IF: Timer1 Interrupt Flag bit

= Timer1 rolled over (must be cleared in software)

= Timer1 has not rolled over

Note 1: PIC16F636/639 only.

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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