PIC18F1230-ESLASHMLQTP datasheet(94/312 Pages) MICROCHIP

94 / 312 page

PIC18F1230/1330

DS39758B-page 92

Advance Information

10.2

PIR Registers

The PIR registers contain the individual flag bits for the

peripheral interrupts. Due to the number of peripheral

interrupt sources, there are three Peripheral Interrupt

Request (Flag) registers (PIR1, PIR2 and PIR3).

Note 1: 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>).

2: User

software

should

ensure

the

appropriate interrupt flag bits are cleared

prior to enabling an interrupt and after

servicing that interrupt.

PIR1: PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 1

U-0

R/W-0

R-0

R/W-0

—

ADIF

RCIF

TXIF

CMP2IF

CMP1IF

CMP0IF

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

Unimplemented: Read as ‘0’

bit 6

ADIF: A/D Converter Interrupt Flag bit

= An A/D conversion completed (must be cleared in software)

= The A/D conversion is not complete

bit 5

RCIF: EUSART Receive Interrupt Flag bit

= The EUSART receive buffer, RCREG, is full (cleared when RCREG is read)

= The EUSART receive buffer is empty

bit 4

TXIF: EUSART Transmit Interrupt Flag bit

= The EUSART transmit buffer, TXREG, is empty (cleared when TXREG is written)

= The EUSART transmit buffer is full

bit 3

CMP2IF: Analog Comparator 2 Flag bit

= The output of CMP2 has changed since last read

= The output of CMP2 has not changed since last read

bit 2

CMP1IF: Analog Comparator 1 Flag bit

= The output of CMP1 has changed since last read

= The output of CMP1 has not changed since last read

bit 1

CMP0IF: Analog Comparator 0 Flag bit

= The output of CMP0 has changed since last read

= The output of CMP0 has not changed since last read

bit 0

TMR1IF: TMR1 Overflow Interrupt Flag bit

= TMR1 register overflowed (must be cleared in software)

= TMR1 register did not overflow

PIC18F1230-E/MLQTP Datasheet(PDF) 94 Page - Microchip Technology

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