PIC16F636T-I/SL(2005) View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F636T-I/SL
(Rev.:2005)

8/14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC12F635/PIC16F636/639

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 (INTCON<7>).

User software should ensure the

appropriate interrupt flag bits are clear

prior to enabling an interrupt.

REGISTER 2-5:

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

R/W-0

EEIF

R/W-0

LVDIF

R/W-0

CRIF

R/W-0

C2IF(1)

R/W-0

C1IF

R/W-0

OSFIF

U-0

R/W-0

—

TMR1IF

bit 7

bit 0

bit 7

EEIF: EEPROM Write Operation Interrupt Flag bit

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

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

bit 6

LVDIF: Low-Voltage Detect Interrupt Flag bit

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

0 = The supply voltage has not crossed selected LVD voltage

bit 5

CRIF: Cryptographic Interrupt Flag bit

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

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

bit 4

C2IF: Comparator 2 Interrupt Flag bit(1)

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

0 = Comparator output (C2OUT bit) has not changed

bit 3

C1IF: Comparator 1 Interrupt Flag bit

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

0 = Comparator output (C1OUT bit) has not changed

bit 2

OSFIF: Oscillator Fail Interrupt Flag bit

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

0 = System clock operating

bit 1

Unimplemented: Read as ‘0’

bit 0

TMR1IF: Timer1 Interrupt Flag bit

1 = Timer1 rolled over (must be cleared in software)

0 = Timer1 has not rolled over

Note 1: PIC16F636/639 only.

Legend:

R = Readable bit

- n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

DS41232B-page 24

Preliminary

© 2005 Microchip Technology Inc.

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