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PIC16F87X Datasheet, PDF (128/218 Pages) Microchip Technology – 28/40-pin 8-Bit CMOS FLASH Microcontrollers
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PIC16F87X
TABLE 12-6: INITIALIZATION CONDITIONS FOR ALL REGISTERS
Register
Devices
Power-on Reset,
Brown-out Reset
MCLR Resets,
WDT Reset
Wake-up via WDT or
Interrupt
W
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
INDF
873 874 876 877
N/A
N/A
N/A
TMR0
PCL
STATUS
873 874 876 877
873 874 876 877
873 874 876 877
xxxx xxxx
0000h
0001 1xxx
uuuu uuuu
0000h
000q quuu(3)
uuuu uuuu
PC + 1(2)
uuuq quuu(3)
FSR
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
PORTA
873 874 876 877
--0x 0000
--0u 0000
--uu uuuu
PORTB
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
PORTC
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
PORTD
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
PORTE
873 874 876 877
---- -xxx
---- -uuu
---- -uuu
PCLATH
INTCON
PIR1
PIR2
873 874 876 877
873 874 876 877
873 874 876 877
873 874 876 877
873 874 876 877
---0 0000
0000 000x
r000 0000
0000 0000
-r-0 0--0
---0 0000
0000 000u
r000 0000
0000 0000
-r-0 0--0
---u uuuu
uuuu uuuu(1)
ruuu uuuu(1)
uuuu uuuu(1)
-r-u u--u(1)
TMR1L
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
TMR1H
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
T1CON
873 874 876 877
--00 0000
--uu uuuu
--uu uuuu
TMR2
873 874 876 877
0000 0000
0000 0000
uuuu uuuu
T2CON
873 874 876 877
-000 0000
-000 0000
-uuu uuuu
SSPBUF
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
SSPCON
873 874 876 877
0000 0000
0000 0000
uuuu uuuu
CCPR1L
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
CCPR1H
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
CCP1CON
873 874 876 877
--00 0000
--00 0000
--uu uuuu
RCSTA
873 874 876 877
0000 000x
0000 000x
uuuu uuuu
TXREG
873 874 876 877
0000 0000
0000 0000
uuuu uuuu
RCREG
873 874 876 877
0000 0000
0000 0000
uuuu uuuu
CCPR2L
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
CCPR2H
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
CCP2CON
873 874 876 877
0000 0000
0000 0000
uuuu uuuu
ADRESH
873 874 876 877
xxxx xxxx
uuuu uuuu
uuuu uuuu
ADCON0
873 874 876 877
0000 00-0
0000 00-0
uuuu uu-u
OPTION_REG 873 874 876 877
1111 1111
1111 1111
uuuu uuuu
TRISA
873 874 876 877
--11 1111
--11 1111
--uu uuuu
TRISB
873 874 876 877
1111 1111
1111 1111
uuuu uuuu
TRISC
873 874 876 877
1111 1111
1111 1111
uuuu uuuu
TRISD
873 874 876 877
1111 1111
1111 1111
uuuu uuuu
TRISE
873 874 876 877
0000 -111
0000 -111
uuuu -uuu
PIE1
873 874 876 877
r000 0000
r000 0000
ruuu uuuu
873 874 876 877
0000 0000
0000 0000
uuuu uuuu
Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ’0’, q = value depends on condition,
r = reserved, maintain clear
Note 1: One or more bits in INTCON, PIR1 and/or PIR2 will be affected (to cause wake-up).
2: When the wake-up is due to an interrupt and the GIE bit is set, the PC is loaded with the interrupt vector
(0004h).
3: See Table 12-5 for RESET value for specific condition.
DS30292C-page 126
 2001 Microchip Technology Inc.
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