PIC18FXX8 Datasheet, PDF (112/402 Pages) Microchip Technology – 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

PIC18FXX8
FIGURE 11-1:
TIMER0 BLOCK DIAGRAM IN 8-BIT MODE
RA4/T0CKI
pin⁽²⁾
T0SE
FOSC/4
1
1
0
Programmable
0
Prescaler
3
T0PS2, T0PS1, T0PS0
T0CS⁽¹⁾
PSA
Sync with
Internal
Clocks
(2 TCY Delay)
Note 1: Upon Reset, Timer0 is enabled in 8-bit mode with clock input from T0CKI max. prescale.
2: I/O pins have diode protection to VDD and VSS.
Data Bus
8
TMR0L
Set Interrupt
Flag bit TMR0IF
on Overflow
FIGURE 11-2:
TIMER0 BLOCK DIAGRAM IN 16-BIT MODE
T0CKI pin⁽²⁾
1
T0SE
FOSC/4
0
1
Programmable ₀
Prescaler
3
T0PS2, T0PS1, T0PS0
T0CS⁽¹⁾
PSA
Sync with
Internal
Clocks
(2 TCY Delay)
TMR0L
8
Note 1: Upon Reset, Timer0 is enabled in 8-bit mode with clock input from T0CKI max. prescale.
2: I/O pins have diode protection to VDD and VSS.
TMR0
High Byte
8
Set Interrupt
Flag bit TMR0IF
on Overflow
8
TMR0H
Read TMR0L
Write TMR0L
8
Data Bus<7:0>
DS41159D-page 110
 2004 Microchip Technology Inc.