PIC16F785 datasheet(21/178 Pages) MICROCHIP

21 / 178 page

 2004 Microchip Technology Inc.

Preliminary

DS41249A-page 19

PIC16F785

2.2.2.5

PIR1 Register

The PIR1 register contains the interrupt flag bits, as

shown in Register 2-5.

PIR1 — PERIPHERAL INTERRUPT 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

enable

bit,

GIE

(INTCON<7>).

User

software should ensure the appropriate

interrupt flag bits are clear prior to

enabling an interrupt.

R/W-0

EEIF

ADIF

CCP1IF

C2IF

C1IF

OSFIF

TMR2IF

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

ADIF: A/D Interrupt Flag bit

= A/D conversion complete

= A/D conversion has not completed or has not been started

bit 5

CCP1IF: CCP1 Interrupt Flag bit

Capture mode:

= A TMR1 register capture occurred (must be cleared in software)

= No TMR1 register capture occurred

Compare mode:

= A TMR1 register compare match occurred (must be cleared in software)

= No TMR1 register compare match occurred

PWM mode:

Unused in this mode

bit 4

C2IF: Comparator 2 Interrupt Flag bit

= Comparator 2 output has changed (must be cleared in software)

= Comparator 2 output has not changed

bit 3

C1IF: Comparator 1 Interrupt Flag bit

= Comparator 1 output has changed (must be cleared in software)

= Comparator 1 output has not changed

bit 2

OSFIF: Oscillator Fail Interrupt Flag bit

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

= System clock operating

bit 1

TMR2IF: Timer 2 to PR2 Match Interrupt Flag bit

= Timer 2 to PR2 match occurred (must be cleared in software)

= Timer 2 to PR2 match has not occurred

bit 0

TMR1IF: Timer 1 Overflow Interrupt Flag bit

= Timer 1 register overflowed (must be cleared in software)

= Timer 1 has not overflowed

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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