PIC12F635EST datasheet(32/234 Pages) MICROCHIP

32 / 234 page

PIC12F635/PIC16F636/639

DS41232D-page 30

2.2.2.5

PIR1 Register

The PIR1 register contains the interrupt flag bits, as

shown in Register 2-5.

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 of the INTCON

appropriate interrupt flag bits are clear

prior to enabling an interrupt.

PIR1: PERIPHERAL INTERRUPT REQUEST REGISTER 1

R/W-0

U-0

R/W-0

EEIF

LVDIF

CRIF

C2IF(1)

C1IF

OSFIF

—TMR1IF

bit 7

bit 0

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

bit 7

EEIF: EE Write Complete 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 Overflow Interrupt Flag bit

= Timer1 rolled over (must be cleared in software)

= Timer1 has not rolled over

Note 1:

PIC16F636/639 only.

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