PIC12F508 datasheet(36/106 Pages) MICROCHIP

36 / 106 page

PIC12F508/509/16F505

DS41236D-page 34

Preliminary

FIGURE 6-3:

TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2

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(1)

GPWU

GPPU

T0CS

T0SE

PSA

PS2

PS1

PS0

1111 1111

N/A

OPTION(2)

RBWU

RBPU

T0CS

T0SE

PSA

PS2

PS1

PS0

1111 1111

N/A

TRISGPIO(1), (3)

—

I/O Control Register

--11 1111

N/A

TRISC(2), (3)

—

RC5

RC4

RC3

RC2

RC1

RC0

--11 1111

Legend:

Shaded cells are not used by Timer0. – = unimplemented, x = unknown, u = unchanged.

Note 1:

PIC12F508/509 only.

PIC16F505 only.

The TRIS of the T0CKI pin is overridden when T0CS = 1.

PC – 1

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

Instruction

Fetch

Timer0

PC + 1

PC + 2

PC + 3

PC + 4

PC + 6

T0 + 1

NT0

NT0 + 1

MOVWF TMR0

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

MOVF TMR0,W

Write TMR0

executed

Read TMR0

reads NT0

Read TMR0

reads NT0

Read TMR0

reads NT0

Read TMR0

reads NT0 + 1

Read TMR0

reads NT0 + 2

Instruction

Executed

PC + 5

(Program

Counter)

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