PIC16F526 Datasheet, PDF (38/122 Pages) Microchip Technology – 14-Pin, 8-Bit Flash Microcontroller

PIC16F526
FIGURE 7-2:
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
PC + 6
MOVWF TMR0 MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W
Timer0
T0
Instruction
Executed
T0 + 1
T0 + 2
NT0
NT0 + 1
NT0 + 2
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
FIGURE 7-3:
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
PC + 6
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 7-1: REGISTERS ASSOCIATED WITH TIMER0
Addr
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
01h
TMR0
Timer0 – 8-bit Real-Time Clock/Counter
08h
CM1CON0 C1OUT C1OUTEN C1POL C1T0CS C1ON C1NREF C1PREF C1WU
0Bh
CM2CON0 C2OUT C2OUTEN C2POL C2PREF2 C2ON C2NREF C2PREF1 C2WU
N/A
OPTION
RBWU
RBPU
T0CS
T0SE
PSA
PS2
PS1
PS0
N/A
TRIS⁽¹⁾
—
—
I/O Control Register (PORTB, PORTC)
Legend: Shaded cells are not used by Timer0. – = unimplemented, x = unknown, u = unchanged.
Note 1: The TRIS of the T0CKI pin is overridden when T0CS = 1.
Value on
Power-On
Reset
xxxx xxxx
1111 1111
1111 1111
1111 1111
--11 1111
Value on
All Other
Resets
uuuu uuuu
uuuu uuuu
uuuu uuuu
1111 1111
--11 1111
DS41326D-page 38
 2010 Microchip Technology Inc.