PIC16F877-20L Datasheet, PDF (54/218 Pages) Microchip Technology – 28/40-Pin 8-Bit CMOS FLASH Microcontrollers

PIC16F87X
6.7 Resetting of Timer1 Register Pair
(TMR1H, TMR1L)
TMR1H and TMR1L registers are not reset to 00h on a
POR, or any other RESET, except by the CCP1 and
CCP2 special event triggers.
T1CON register is reset to 00h on a Power-on Reset,
or a Brown-out Reset, which shuts off the timer and
leaves a 1:1 prescale. In all other RESETS, the register
is unaffected.
6.8 Timer1 Prescaler
The prescaler counter is cleared on writes to the
TMR1H or TMR1L registers.
TABLE 6-2: REGISTERS ASSOCIATED WITH TIMER1 AS A TIMER/COUNTER
Address Name Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on:
POR,
BOR
0Bh,8Bh,
10Bh, 18Bh
INTCON
GIE
0Ch
PIR1
PSPIF⁽¹⁾
8Ch
PIE1
PSPIE⁽¹⁾
PEIE
ADIF
ADIE
T0IE
RCIF
RCIE
INTE
TXIF
TXIE
RBIE
SSPIF
SSPIE
T0IF
CCP1IF
CCP1IE
INTF
TMR2IF
TMR2IE
RBIF
TMR1IF
TMR1IE
0000 000x
0000 0000
0000 0000
0Eh
TMR1L Holding Register for the Least Significant Byte of the 16-bit TMR1 Register
xxxx xxxx
0Fh
TMR1H Holding Register for the Most Significant Byte of the 16-bit TMR1 Register
xxxx xxxx
10h
T1CON
—
—
T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON --00 0000
Legend: x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are not used by the Timer1 module.
Note 1: Bits PSPIE and PSPIF are reserved on the PIC16F873/876; always maintain these bits clear.
Value on
all other
RESETS
0000 000u
0000 0000
0000 0000
uuuu uuuu
uuuu uuuu
--uu uuuu
DS30292D-page 54
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