PIC18F258 Datasheet, PDF (110/384 Pages) Microchip Technology – High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN

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>
DS41159B-page 108
Preliminary
 2002 Microchip Technology Inc.