PIC16C924-04 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C924-04

8-Bit CMOS Microcontroller with LCD Driver

Microchip Technology 

PIC16C9XX

FIGURE 7-3: TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2

PC

(Program

Counter)

Instruction

Fetch

TMR0

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

PC-1

PC

PC+1

PC+2

PC+3

PC+4

PC+5

MOVWF TMR0 MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W

PC+6

T0

T0+1

NT0

NT0+1

PC+6

Instruction

Execute

Write TMR0

executed

Read TMR0

reads NT0

Read TMR0

reads NT0

Read TMR0

reads NT0

Read TMR0

reads NT0

Read TMR0

reads NT0 + 1

FIGURE 7-4: TIMER0 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)

Timer0

FEh

FFh

00h

01h

02h

1

1

T0IF bit

(INTCON<2>)

GIE bit

(INTCON<7>)

INSTRUCTION

FLOW

PC

Instruction

fetched

Instruction

executed

PC

Inst (PC)

Inst (PC-1)

PC +1

Inst (PC+1)

Inst (PC)

PC +1

Dummy cycle

0004h

Inst (0004h)

Dummy cycle

0005h

Inst (0005h)

Inst (0004h)

Note 1: Interrupt flag bit T0IF is sampled here (every Q1).

2: Interrupt latency = 4TCY where TCY = instruction cycle time.

3: CLKOUT is available only in RC oscillator mode.

DS30444E - page 46

© 1997 Microchip Technology Inc.

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