2000 Microchip Technology Inc.
Advanced Information
DS30475A-page 125
PIC18CXX8
13.2
Timer1 Oscillator
The Timer1 oscillator may be used as the clock source
for Timer3. The Timer1 oscillator is enabled by setting
the T1OSCEN bit (T1CON Register). The oscillator is
a low power oscillator rated up to 200 kHz. Refer to
“Timer1 Module”, Section 11.0 for Timer1 oscillator
details.
13.3
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 (PIR Reg-
isters). This interrupt can be enabled/disabled by set-
ting/clearing TMR3 interrupt enable bit TMR3IE (PIE
13.4
Resetting Timer3 Using a CCP Trigger
Output
If the CCP module is configured in Compare mode to
generate a “special event trigger" (CCP1M3:CCP1M0
= 1011), this signal will reset Timer3.
Timer3 must be configured for either timer or Synchro-
nized Counter mode to take advantage of this feature. If
Timer3 is running in Asynchronous Counter mode, this
RESET operation may not work. In the event that a write
to Timer3 coincides with a special event trigger from
CCP1, the write will take precedence. In this mode of
operation,
the
CCPR1H:CCPR1L
registers
pair
becomes the period register for Timer3. Refer to
“Capture/Compare/PWM (CCP) Modules”, Section 14.0
for CCP details.
TABLE 13-1:
REGISTERS ASSOCIATED WITH TIMER3 AS A TIMER/COUNTER
Note:
The special event triggers from the CCP
module will not set interrupt flag bit
TMR3IF (PIR registers).
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
CMIF
BCLIF
LVDIF
TMR3IF
CCP2IF
-0-- 0000
PIE2
CMIE
BCLIE
LVDIE
TMR3IE
CCP2IE
-0-- 0000
IPR2
CMIP
BCLIP
LVDIP
TMR3IP
CCP2IP
-0-- 0000
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
T1OSCEN
T1SYNC
TMR1CS
TMR1ON
0-00 0000
u-uu uuuu
T3CON
RD16
T3CCP2 T3CKPS1 T3CKPS0
T3CCP1
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.
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