PIC16F526-ISLASHP datasheet(48/122 Pages) MICROCHIP

48 / 122 page

PIC16F526

DS41326D-page 48

 2010 Microchip Technology Inc.

8.3

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 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 8-3 for a full description of Reset states of all

registers.

TABLE 8-3:

RESET CONDITIONS FOR REGISTERS

Address

Power-on Reset

MCLR Reset, WDT Time-out,

Wake-up On Pin Change

—

qqqq qqq0(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

100x xxxx

1uuu uuuu

OSCCAL

05h

1111 111-

uuuu uuu-

PORTB

06h

--xx xxxx

--uu uuuu

PORTC

07h

--xx xxxx

--uu uuuu

CMICON0

08h

q111 1111

quuu uuuu

ADCON0

09h

1111 1100

ADRES

0Ah

xxxx xxxx

uuuu uuuu

CM2CON0

0Bh

q111 1111

quuu uuuu

VRCON

0Ch

001-1111

uuu-uuuu

OPTION

—

1111 1111

TRISB

—

--11 1111

TRISC

—

--11 1111

EECON

21h/61h

---0 x000

---0 q000

EEDATA

25h/65h

xxxx xxxx

uuuu uuuu

EEADR

26h/66h

--xx xxxx

--uu uuuu

Legend: u = unchanged, x = unknown, – = unimplemented bit, read as ‘0’, q = value depends on condition.

Note 1:

Bits <7:1> of W register contain oscillator calibration values due to MOVLW XX instruction at top of

memory.

See Table 8-4 for Reset value for specific conditions.

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