PIC12F508-I/SL 查看數據表（PDF） - Microchip Technology
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PIC12F508-I/SL Datasheet PDF : 110 Pages
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PIC12F508/509/16F505
FIGURE 6-3:
TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2
PC
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
(Program
Counter)
PC – 1
PC
PC + 1
PC + 2
PC + 3
PC + 4
PC + 5
PC + 6
Instruction
Fetch
MOVWF TMR0 MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W
Timer0
T0
Instruction
Executed
T0 + 1
NT0
NT0 + 1
Write TMR0 Read TMR0 Read TMR0
executed
reads NT0 reads NT0
Read TMR0 Read TMR0 Read TMR0
reads NT0 reads NT0 + 1 reads NT0 + 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
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:
Note 1:
2:
3:
Shaded cells are not used by Timer0. – = unimplemented, x = unknown, u = unchanged.
PIC12F508/509 only.
PIC16F505 only.
The TRIS of the T0CKI pin is overridden when T0CS = 1.
uuuu uuuu
1111 1111
1111 1111
--11 1111
--11 1111
DS41236E-page 36
© 2009 Microchip Technology Inc.
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