Datasheet

PIC18F6520/8520/6620/8620/6720/8720
DS39609C-page 132  2003-2013 Microchip Technology Inc.
FIGURE 11-1: TIMER0 BLOCK DIAGRAM IN 8-BIT MODE
FIGURE 11-2: TIMER0 BLOCK DIAGRAM IN 16-BIT MODE
Note: Upon Reset, Timer0 is enabled in 8-bit mode with clock input from T0CKI max. prescale.
RA4/T0CKI pin
T0SE
0
1
0
1
T0CS
FOSC/4
Programmable
Prescaler
Sync with
Internal
Clocks
TMR0
(2 TCY delay)
Data Bus
8
PSA
T0PS2, T0PS1, T0PS0
Set Interrupt
Flag bit TMR0IF
on Overflow
3
Note: Upon Reset, Timer0 is enabled in 8-bit mode with clock input from T0CKI max. prescale.
RA4/T0CKI
T0SE
0
1
0
1
T0CS
FOSC/4
Programmable
Prescaler
Sync with
Internal
Clocks
TMR0L
(2 TCY delay)
Data Bus<7:0>
8
PSA
T0PS2, T0PS1, T0PS0
Set Interrupt
Flag bit TMR0IF
on Overflow
3
TMR0
TMR0H
High Byte
8
8
8
Read TMR0L
Write TMR0L
pin