PIC16LC621T-04I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC621T-04I/SO

EPROM-Based 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC16C62X

FIGURE 6-3:

TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2

PC

(Program

Counter)

Instruction

Fetch

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,WMOVF TMR0,WMOVF TMR0,WMOVF TMR0,WMOVF TMR0,W

PC+6

TMR0

T0

T0+1

NT0

NT0+1

Instruction

Execute

Write TMR0 Read TMR0 Read TMR0 Read TMR0 Read TMR0 Read TMR0

executed

reads NT0 reads NT0 reads NT0 reads NT0 reads NT0 + 1

FIGURE 6-4:

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)

TMR0 timer

FEh

FFh

00h

01h

02h

1

1

T0IF bit

(INTCON<2>)

GIE bit

(INTCON<7>)

INSTRUCTION FLOW

PC

PC

Instruction

fetched

Inst (PC)

Instruction

executed

Inst (PC-1)

PC +1

Inst (PC+1)

Inst (PC)

Interrupt Latency Time(2)

PC +1

Dummy cycle

0004h

Inst (0004h)

Dummy cycle

0005h

Inst (0005h)

Inst (0004h)

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

2: Interrupt latency = 3TCY, where TCY = instruction cycle time.

3: CLKOUT is available only in RC Oscillator mode.

DS30235J-page 32

 2003 Microchip Technology Inc.

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