PIC12CE519T-04 查看數據表（PDF） - Microchip Technology

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PIC12CE519T-04

8-Pin, 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC12C5XX

FIGURE 6-2: TIMER0 TIMING: INTERNAL CLOCK/NO PRESCALE

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

PC+6

Timer0

T0

Instruction

Executed

T0+1

T0+2

NT0

NT0+1

NT0+2

Write TMR0

executed

Read TMR0

reads NT0

Read TMR0

reads NT0

Read TMR0

reads NT0

Read TMR0

Read TMR0

reads NT0 + 1 reads NT0 + 2

FIGURE 6-3: TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2

PC

(Program

Counter)

Instruction

Fetch

Timer0

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

PC+6

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

T0

T0+1

NT0

NT0+1

T0

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

TABLE 6-1: REGISTERS ASSOCIATED WITH TIMER0

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Value on

Power-On

Reset

Value on

All Other

Resets

01h

TMR0 Timer0 - 8-bit real-time clock/counter

xxxx xxxx uuuu uuuu

N/A

OPTION GPWU GPPU T0CS T0SE PSA PS2 PS1 PS0 1111 1111 1111 1111

N/A

TRIS

—

— GP5 GP4 GP3 GP2 GP1 GP0 --11 1111 --11 1111

Legend: Shaded cells not used by Timer0, - = unimplemented, x = unknown, u = unchanged,

DS40139E-page 26

© 1999 Microchip Technology Inc.

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