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PIC16F87XA Datasheet, PDF (152/234 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers
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PIC16F87XA
TABLE 14-6: INITIALIZATION CONDITIONS FOR ALL REGISTERS
Register
Devices
Power-on Reset,
Brown-out Reset
MCLR Resets,
WDT Reset
Wake-up via WDT or
Interrupt
W
INDF
73A 74A 76A 77A
73A 74A 76A 77A
xxxx xxxx
N/A
uuuu uuuu
N/A
uuuu uuuu
N/A
TMR0
PCL
STATUS
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
xxxx xxxx
0000 0000
0001 1xxx
uuuu uuuu
0000 0000
000q quuu(3)
uuuu uuuu
PC + 1(2)
uuuq quuu(3)
FSR
73A 74A 76A 77A
xxxx xxxx
uuuu uuuu
uuuu uuuu
PORTA
73A 74A 76A 77A
--0x 0000
--0u 0000
--uu uuuu
PORTB
73A 74A 76A 77A
xxxx xxxx
uuuu uuuu
uuuu uuuu
PORTC
PORTD
PORTE
PCLATH
INTCON
PIR1
PIR2
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
xxxx xxxx
xxxx xxxx
---- -xxx
---0 0000
0000 000x
r000 0000
0000 0000
-0-0 0--0
uuuu uuuu
uuuu uuuu
---- -uuu
---0 0000
0000 000u
r000 0000
0000 0000
-0-0 0--0
uuuu uuuu
uuuu uuuu
---- -uuu
---u uuuu
uuuu uuuu(1)
ruuu uuuu(1)
uuuu uuuu(1)
-u-u u--u(1)
TMR1L
73A 74A 76A 77A
xxxx xxxx
uuuu uuuu
uuuu uuuu
TMR1H
T1CON
TMR2
T2CON
SSPBUF
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
xxxx xxxx
--00 0000
0000 0000
-000 0000
xxxx xxxx
uuuu uuuu
--uu uuuu
0000 0000
-000 0000
uuuu uuuu
uuuu uuuu
--uu uuuu
uuuu uuuu
-uuu uuuu
uuuu uuuu
SSPCON
73A 74A 76A 77A
0000 0000
0000 0000
uuuu uuuu
CCPR1L
73A 74A 76A 77A
xxxx xxxx
uuuu uuuu
uuuu uuuu
CCPR1H
73A 74A 76A 77A
xxxx xxxx
uuuu uuuu
uuuu uuuu
CCP1CON
73A 74A 76A 77A
--00 0000
--00 0000
--uu uuuu
RCSTA
TXREG
RCREG
CCPR2L
CCPR2H
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
73A 74A 76A 77A
0000 000x
0000 0000
0000 0000
xxxx xxxx
xxxx xxxx
0000 000x
0000 0000
0000 0000
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
CCP2CON
73A 74A 76A 77A
0000 0000
0000 0000
uuuu uuuu
ADRESH
73A 74A 76A 77A
xxxx xxxx
uuuu uuuu
uuuu uuuu
ADCON0
73A 74A 76A 77A
0000 00-0
0000 00-0
uuuu uu-u
OPTION_REG 73A 74A 76A 77A
1111 1111
1111 1111
uuuu uuuu
TRISA
73A 74A 76A 77A
--11 1111
--11 1111
--uu uuuu
TRISB
73A 74A 76A 77A
1111 1111
1111 1111
uuuu uuuu
TRISC
73A 74A 76A 77A
1111 1111
1111 1111
uuuu uuuu
Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’, q = value depends on condition,
r = reserved, maintain clear. Shaded cells indicate conditions do not apply for the designated device.
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 14-5 for Reset value for specific condition.
DS39582B-page 150
 2003 Microchip Technology Inc.
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