PIC12F508-E Datasheet, PDF (48/106 Pages) Microchip Technology – 8/14-Pin, 8-Bit Flash Microcontrollers

PIC12F508/509/16F505
TABLE 7-4: RESET CONDITIONS FOR REGISTERS – PIC16F505
Register
Address
Power-on Reset
MCLR Reset, WDT Time-out,
Wake-up On Pin Change
W
—
qqqq qqqu⁽¹⁾
qqqq qqqu⁽¹⁾
INDF
00h
xxxx xxxx
uuuu uuuu
TMR0
01h
xxxx xxxx
uuuu uuuu
PC
02h
1111 1111
1111 1111
STATUS
03h
0001 1xxx
q00q quuu^{(2), (3)}
FSR
04h
100x xxxx
1uuu uuuu
OSCCAL
05h
1111 111-
uuuu uuu-
PORTB
06h
--xx xxxx
--uu uuuu
PORTC
07h
--xx xxxx
--uu uuuu
OPTION
—
1111 1111
1111 1111
TRISB
—
--11 1111
--11 1111
TRISC
—
--11 1111
--11 1111
Legend: u = unchanged, x = unknown, – = unimplemented bit, read as ‘0’, q = value depends on condition.
Note 1: Bits <7:2> of W register contain oscillator calibration values due to MOVLW XX instruction at top of
memory.
2: See Table 7-5 for Reset value for specific conditions.
3: If Reset was due to wake-up on pin change, then bit 7 = 1. All other Resets will cause bit 7 = 0.
TABLE 7-5: RESET CONDITION FOR SPECIAL REGISTERS
STATUS Addr: 03h
Power-on Reset
0001 1xxx
MCLR Reset during normal operation
000u uuuu
MCLR Reset during Sleep
0001 0uuu
WDT Reset during Sleep
0000 0uuu
WDT Reset normal operation
0000 uuuu
Wake-up from Sleep on pin change
1001 0uuu
Legend: u = unchanged, x = unknown, – = unimplemented bit, read as ‘0’.
PCL Addr: 02h
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
DS41236D-page 46
Preliminary
© 2007 Microchip Technology Inc.