PIC12F508 datasheet(47/98 Pages) MICROCHIP

47 / 98 page

 2004 Microchip Technology Inc.

Preliminary

DS41236A-page 45

PIC12F508/509/16F505

TABLE 7-4:

RESET CONDITIONS FOR REGISTERS – PIC16F505

TABLE 7-5:

RESET CONDITION FOR SPECIAL REGISTERS

Address

Power-on Reset

MCLR Reset, WDT Time-out,

Wake-up On Pin Change

W—

qqqq qqqu(1)

INDF

00h

xxxx xxxx

uuuu uuuu

TMR0

01h

xxxx xxxx

uuuu uuuu

02h

1111 1111

STATUS

03h

0001 1xxx

q00q quuu(2), (3)

FSR

04h

110x xxxx

11uu uuuu

OSCCAL

05h

1111 111-

uuuu uuu-

PORTB

06h

--xx xxxx

--uu uuuu

PORTC

07h

--xx xxxx

--uu uuuu

OPTION

—

1111 1111

TRISB

—

--11 1111

TRISC

—

--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.

See Table 7-8 for Reset value for specific conditions.

If Reset was due to wake-up on pin change, then bit 7 = 1. All other Resets will cause bit 7 = 0.

STATUS Addr: 03h

PCL Addr: 02h

Power-on Reset

0001 1xxx

1111 1111

MCLR Reset during normal operation

000u uuuu

1111 1111

MCLR Reset during Sleep

0001 0uuu

1111 1111

WDT Reset during Sleep

0000 0uuu

1111 1111

WDT Reset normal operation

0000 uuuu

1111 1111

Wake-up from Sleep on pin change

1001 0uuu

1111 1111

Legend: u = unchanged, x = unknown, — = unimplemented bit, read as ‘0’.

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