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

FIGURE 12-8:

INT PIN INTERRUPT TIMING

OSC1

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

CLKOUT(3)

(4)

INT pin

(1)

INTF Flag

(INTCON<1>)

GIE bit

(INTCON<7>)

(1)

(5)

Interrupt Latency(2)

Instruction Flow

PC

Instruction

Fetched

PC

Inst (PC)

PC + 1

Inst (PC + 1)

PC + 1

—

0004h

Inst (0004h)

0005h

Inst (0005h)

Instruction

Executed

Inst (PC – 1)

Inst (PC)

Dummy Cycle

Dummy Cycle

Inst (0004h)

Note 1: INTF flag is sampled here (every Q1).

2: Asynchronous interrupt latency = 3-4 TCY. Synchronous latency = 3 TCY, where TCY = instruction cycle time. Latency

is the same whether Inst (PC) is a single cycle or a 2-cycle instruction.

3: CLKOUT is available only in INTOSC and RC Oscillator modes.

4: For minimum width of INT pulse, refer to AC specifications in Section 15.0 “Electrical Specifications”.

5: INTF is enabled to be set any time during the Q4-Q1 cycles.

TABLE 12-6: SUMMARY OF INTERRUPT REGISTERS

Address Name Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR, BOD,

WUR

Value on

all other

Resets

0Bh, 8Bh INTCON

0Ch

PIR1

8Ch

PIE1

GIE

EEIF

EEIE

PEIE

LVDIF

LVDIE

T0IE

CRIF

CRIE

INTE

C2IF(1)

C2IE(1)

RAIE

C1IF

C1IE

T0IF

OSFIF

OSFIE

INTF

—

—

RAIF 0000 0000 0000 0000

TMR1IF 0000 00-0 0000 00-0

TMR1IE 0000 00-0 0000 00-0

Legend:

Note 1:

x = unknown, u = unchanged, — = unimplemented, read as ‘0’, q = value depends upon condition.

Shaded cells are not used by the interrupt module.

PIC16F636/639 only.

© 2005 Microchip Technology Inc.

Preliminary

DS41232B-page 123

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