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PIC16F688 Datasheet, PDF (109/174 Pages) Microchip Technology – 14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
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PIC16F688
TABLE 11-4: INITIALIZATION CONDITION FOR REGISTERS
Register
Address
Power-on
Reset
MCLR Reset
WDT Reset
Brown-out Detect(1)
Wake-up from Sleep
through Interrupt
Wake-up from Sleep
through WDT Time-out
W
—
xxxx xxxx
uuuu uuuu
uuuu uuuu
INDF
00h/80h/100h/180h xxxx xxxx
xxxx xxxx
uuuu uuuu
TMR0
PCL
STATUS
01h/101h
02h/82h/102h/182h
03h/83h/103h/183h
xxxx xxxx
0000 0000
0001 1xxx
uuuu uuuu
0000 0000
000q quuu(4)
uuuu uuuu
PC + 1(3)
uuuq quuu(4)
FSR
04h/84h/104h/184h xxxx xxxx
uuuu uuuu
uuuu uuuu
PORTA
05h/105h
--xx xx00
--00 0000
--uu uuuu
PORTC
07h/107h
--xx xx00
--00 0000
--uu uuuu
PCLATH
INTCON
PIR1
0Ah/8Ah/10Ah/18Ah
0Bh/8Bh/10Bh/18Bh
0Ch
---0 0000
0000 0000
0000 0000
---0 0000
0000 0000
0000 0000
---u uuuu
uuuu uuuu(2)
uuuu uuuu(2)
TMR1L
0Eh
xxxx xxxx
uuuu uuuu
uuuu uuuu
TMR1H
0Fh
xxxx xxxx
uuuu uuuu
uuuu uuuu
T1CON
10h
0000 0000
uuuu uuuu
-uuu uuuu
BAUDCTL
11h
01-0 0-00
01-0 0-00
uu-u u-uu
SPBRGH
12h
-000 0000
-000 0000
-uuu uuuu
SPBRG
13h
0000 0000
0000 0000
uuuu uuuu
RCREG
14h
0000 0000
0000 0000
uuuu uuuu
TXREG
15h
0000 0000
0000 0000
uuuu uuuu
TXSTA
16h
0000 0010
0000 0010
uuuu uuuu
RCSTA
17h
000x 000x
000x 000x
uuuu uuuu
WDTCON
18h
---0 1000
---0 1000
---u uuuu
CMCON0
19h
0000 0000
0000 0000
uuuu uuuu
CMCON1
1Ah
---- --10
---- --10
---- --uu
ADRESH
1Eh
xxxx xxxx
uuuu uuuu
uuuu uuuu
ADCON0
1Fh
00-0 0000
00-0 0000
uu-u uuuu
OPTION_REG
81h/181h
1111 1111
1111 1111
uuuu uuuu
TRISA
85h/185h
--11 1111
--11 1111
--uu uuuu
TRISC
87h/187h
--11 1111
--11 1111
--uu uuuu
PIE1
PCON
8Ch
0000 0000
0000 0000
8Eh
--01 --0x
--0u --uu(1,5)
uuuu uuuu
--uu --uu
Legend:
Note 1:
2:
3:
4:
5:
u = unchanged, x = unknown, — = unimplemented bit, reads as ‘0’, q = value depends on condition.
If VDD goes too low, Power-on Reset will be activated and registers will be affected differently.
One or more bits in INTCON and/or PIR1 will be affected (to cause wake-up).
When the wake-up is due to an interrupt and the GIE bit is set, the PC is loaded with the interrupt
vector (0004h).
See Table 11-5 for Reset value for specific condition.
If Reset was due to brown-out, then bit 0 = 0. All other Resets will cause bit 0 = u.
 2004 Microchip Technology Inc.
Preliminary
DS41203B-page 107
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