PIC16F506T-ISLASHMCSQTP datasheet(63/116 Pages) MICROCHIP

63 / 116 page

Preliminary

DS41268C-page 61

PIC12F510/16F506

10.3

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 Reset on pin change

• Wake-up from Sleep Reset on comparator

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 from

Sleep Reset on pin change or wake-up from Sleep

Reset on comparator change. The exceptions are TO,

PD, CWUF 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 10-4 for a full description of Reset

states of all registers.

TABLE 10-3:

RESET CONDITIONS FOR REGISTERS – PIC12F510

Address

Power-on Reset

MCLR Reset, WDT Time-out,

Wake-up On Pin Change, Wake-up on

Comparator Change

W—

qqqq qqqu(1)

INDF

00h

xxxx xxxx

uuuu uuuu

TMR0

01h

xxxx xxxx

uuuu uuuu

PCL

02h

1111 1111

STATUS

03h

0001 1xxx

qq0q quuu(2)

FSR

04h

110x xxxx

11uu uuuu

OSCCAL

05h

1111 111-

uuuu uuu-

GPIO

06h

--xx xxxx

--uu uuuu

CM1CON0

07h

1111 1111

uuuu uuuu

ADCON0

08h

1111 1100

uu11 1100

ADRES

09h

xxxx xxxx

uuuu uuuu

OPTION

—

1111 1111

TRISIO

—

--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 10-5 for Reset value for specific conditions.

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