PIC12F508_09 datasheet(47/110 Pages) MICROCHIP

47 / 110 page

DS41236E-page 47

PIC12F508/509/16F505

7.3

Reset

The device differentiates between various kinds of

Reset:

• Power-on Reset (POR)

•MCLR Reset during normal operation

•MCLR Reset during Sleep

• WDT time-out Reset during normal operation

• WDT time-out Reset during Sleep

• Wake-up from Sleep on pin change

Some registers are not reset in any way, they are

unknown on POR and unchanged in any other Reset.

Most other registers are reset to “Reset state” on

Power-on Reset (POR), MCLR, WDT or Wake-up on

pin change Reset during normal operation. They are

not affected by a WDT Reset during Sleep or MCLR

Reset during Sleep, since these Resets are viewed as

resumption of normal operation. The exceptions to this

are TO, PD and RBWUF/GPWUF bits. They are set or

cleared differently in different Reset situations. These

bits are used in software to determine the nature of

Reset. See Table 7-4 for a full description of Reset

states of all registers.

TABLE 7-3:

RESET CONDITIONS FOR REGISTERS – PIC12F508/509

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(4)

04h

110x xxxx

11uu uuuu

FSR(5)

04h

111x xxxx

111u uuuu

OSCCAL

05h

1111 111-

uuuu uuu-

GPIO

06h

--xx xxxx

--uu uuuu

OPTION

—

1111 1111

TRIS

—

--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 7-5 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.

PIC12F509 only.

PIC12F508 only.

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