PIC16C781 datasheet(21/188 Pages) MICROCHIP

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Preliminary

DS41171B-page 21

PIC16C781/782

2.7

PIR1 Register

This register contains the individual flag bits for the

peripheral interrupts.

PERIPHERAL INTERRUPT REGISTER (PIR1 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 soft-

ware should ensure the appropriate inter-

rupt flag bits are clear prior to enabling an

interrupt.

R/W-0

U-0

R/W-0

LVDIF

ADIF

C2IF

C1IF

—

—TMR1IF

bit7

bit 0

bit 7

LVDIF: Low Voltage Detect Interrupt Flag bit

= The supply voltage has fallen below the specified LVD voltage (must be cleared in software)

= The supply voltage is greater than the specified LVD voltage

bit 6

ADIF: Analog-to-Digital Converter Interrupt Flag bit

= An ADC conversion completed (must be cleared in software)

= The ADC conversion is not complete

bit 5

C2IF: Comparator C2 Interrupt Flag bit

= Comparator C2 input has crossed the threshold (must be cleared in software)

= Comparator C2 input has not crossed the threshold

bit 4

C1IF: Comparator C1 Interrupt Flag bit

= Comparator C1 input has crossed the threshold (must be cleared in software)

= Comparator C1 input has not crossed the threshold

bit 3-1

Unimplemented: Read as ‘0’

bit 0

TMR1IF: TMR1 Overflow Interrupt Flag bit

= TMR1 register overflowed (must be cleared in software)

= TMR1 register did not overflow

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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