Mikroelektronika MikroE Development Kits MIKROE-998 Scheda Tecnica
Codici prodotto
MIKROE-998
© 2008 Microchip Technology Inc.
DS39646C-page 163
PIC18F8722 FAMILY
12.3
Prescaler
An 8-bit counter is available as a prescaler for the Timer0
module. The prescaler is not directly readable or writable;
its value is set by the PSA and T0PS<2:0> bits
(T0CON<3:0>) which determine the prescaler
assignment and prescale ratio.
module. The prescaler is not directly readable or writable;
its value is set by the PSA and T0PS<2:0> bits
(T0CON<3:0>) which determine the prescaler
assignment and prescale ratio.
Clearing the PSA bit assigns the prescaler to the
Timer0 module. When it is assigned, prescale values
from 1:2 through 1:256 in power-of-2 increments are
selectable.
Timer0 module. When it is assigned, prescale values
from 1:2 through 1:256 in power-of-2 increments are
selectable.
When assigned to the Timer0 module, all instructions
writing to the TMR0 register (e.g., CLRF TMR0, MOVWF
TMR0
writing to the TMR0 register (e.g., CLRF TMR0, MOVWF
TMR0
, BSF TMR0, etc.) clear the prescaler count.
12.3.1
SWITCHING PRESCALER
ASSIGNMENT
ASSIGNMENT
The prescaler assignment is fully under software
control and can be changed “on-the-fly” during program
execution.
control and can be changed “on-the-fly” during program
execution.
12.4
Timer0 Interrupt
The TMR0 interrupt is generated when the TMR0
register overflows from FFh to 00h in 8-bit mode, or
from FFFFh to 0000h in 16-bit mode. This overflow sets
the TMR0IF flag bit. The interrupt can be masked by
clearing the TMR0IE bit (INTCON<5>). Before re-
enabling the interrupt, the TMR0IF bit must be cleared
in software by the Interrupt Service Routine.
register overflows from FFh to 00h in 8-bit mode, or
from FFFFh to 0000h in 16-bit mode. This overflow sets
the TMR0IF flag bit. The interrupt can be masked by
clearing the TMR0IE bit (INTCON<5>). Before re-
enabling the interrupt, the TMR0IF bit must be cleared
in software by the Interrupt Service Routine.
Since Timer0 is shut down in Sleep mode, the TMR0
interrupt cannot awaken the processor from Sleep.
interrupt cannot awaken the processor from Sleep.
TABLE 12-1:
REGISTERS ASSOCIATED WITH TIMER0
Note:
Writing to TMR0 when the prescaler is
assigned to Timer0 will clear the prescaler
count, but will not change the prescaler
assignment.
assigned to Timer0 will clear the prescaler
count, but will not change the prescaler
assignment.
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset
Values
on page
TMR0L
Timer0 Register Low Byte
TMR0H
Timer0 Register High Byte
INTCON
GIE/GIEH PEIE/GIEL
TMR0IE
INT0IE
RBIE
TMR0IF
INT0IF
RBIF
T0CON
TMR0ON
T08BIT
T0CS
T0SE
PSA
T0PS2
T0PS1
T0PS0
TRISA
TRISA7
(1)
TRISA6
(1)
TRISA5
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0
Legend: Shaded cells are not used by Timer0.
Note 1:
PORTA<7:6> and their direction bits are individually configured as port pins based on various primary
oscillator modes. When disabled, these bits read as ‘0’.
oscillator modes. When disabled, these bits read as ‘0’.