PIC18F6520-I Datasheet, PDF (134/380 Pages) Micrel Semiconductor – 64/80-Pin High-Performance, 256 Kbit to 1 Mbit Enhanced Flash Microcontrollers with A/D

PIC18F6520/8520/6620/8620/6720/8720
FIGURE 11-1:
TIMER0 BLOCK DIAGRAM IN 8-BIT MODE
FOSC/4
RA4/T0CKI pin
T0SE
0
0
1
Programmable
1
Prescaler
3
T0PS2, T0PS1, T0PS0
T0CS
PSA
Sync with
Internal
Clocks
(2 TCY delay)
Note: Upon Reset, Timer0 is enabled in 8-bit mode with clock input from T0CKI max. prescale.
Data Bus
8
TMR0
Set Interrupt
Flag bit TMR0IF
on Overflow
FIGURE 11-2:
TIMER0 BLOCK DIAGRAM IN 16-BIT MODE
FOSC/4
RA4/T0CKI
pin
T0SE
0
0
1
Programmable 1
Prescaler
3
PSA
T0PS2, T0PS1, T0PS0
T0CS
Sync with
Internal
Clocks
(2 TCY delay)
TMR0L
8
Note: Upon Reset, Timer0 is enabled in 8-bit mode with clock input from T0CKI max. prescale.
TMR0
High Byte
8
Set Interrupt
Flag bit TMR0IF
on Overflow
8
TMR0H
Read TMR0L
Write TMR0L
8
Data Bus<7:0>
DS39609B-page 132
 2004 Microchip Technology Inc.