
2002 Microchip Technology Inc.
Preliminary
DS30485A-page 111
PIC18FXX39
13.2
Timer3 Interrupt
The TMR3 Register pair (TMR3H:TMR3L) increments
from 0000h to FFFFh and rolls over to 0000h. The
TMR3 Interrupt, if enabled, is generated on overflow,
which is latched in interrupt flag bit, TMR3IF
(PIR2<1>). This interrupt can be enabled/disabled by
setting/clearing TMR3 interrupt enable bit, TMR3IE
(PIE2<1>).
TABLE 13-1:
REGISTERS ASSOCIATED WITH TIMER3 AS A TIMER/COUNTER
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
All Other
RESETS
INTCON
GIE/GIEH PEIE/GIEL TMR0IE
INT0IE
RBIE
TMR0IF
INT0IF
RBIF
0000 000x
0000 000u
PIR2
—
EEIF
BCLIF
LVDIF
TMR3IF
—
---0 0000
PIE2
—
EEIE
BCLIE
LVDIE
TMR3IE
—
---0 0000
IPR2
—
EEIP
BCLIP
LVDIP
TMR3IP
—
---1 1111
TMR3L
Holding Register for the Least Significant Byte of the 16-bit TMR3 Register
xxxx xxxx
uuuu uuuu
TMR3H
Holding Register for the Most Significant Byte of the 16-bit TMR3 Register
xxxx xxxx
uuuu uuuu
T1CON
RD16
—
T1CKPS1 T1CKPS0
—
T1SYNC TMR1CS TMR1ON 0-00 0000 u-uu uuuu
T3CON
RD16
—
T3CKPS1 T3CKPS0
—
T3SYNC TMR3CS TMR3ON 0000 0000 uuuu uuuu
Legend:
x
= unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are not used by the Timer1 module.