PIC12F519-ESLASHMS datasheet(43/96 Pages) MICROCHIP

43 / 96 page

DS41319B-page 41

PIC12F519

PC will then roll over to the users program at address

0x000. The user then has the option of writing the value

to the OSCCAL Register (05h) or ignoring it.

OSCCAL, when written to with the calibration value, will

“trim” the internal oscillator to remove process variation

from the oscillator frequency.

For the PIC12F519 device, only bits <7:1> of OSCCAL

are used for calibration. See Register 4-3 for more

information.

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, and they are

unknown on Power-on Reset (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 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 8-3 for a full description

of Reset states of all registers.

TABLE 8-3:

RESET CONDITIONS FOR REGISTERS

Note:

Erasing the device will also erase the

pre-programmed internal calibration value

for the internal oscillator. The calibration

value must be read prior to erasing the

part so it can be reprogrammed correctly

later.

Note:

The bit 0 of the OSCCAL register is

unimplemented and should be written as

‘0’

when

modifying

OSCCAL

for

compatibility with future devices.

Address

Power-on Reset

MCLR Reset, WDT Time-out,

Wake-up On Pin Change

W—

qqqq qqq0(1)

INDF

00h

xxxx xxxx

uuuu uuuu

TMR0

01h

xxxx xxxx

uuuu uuuu

PCL

02h

1111 1111

STATUS

03h

0-01 1xxx

q-0q quuu(2), (3)

FSR

04h

110x xxxx

11uu uuuu

OSCCAL

05h

1111 111-

uuuu uuu-

PORTB

06h

--xx xxxx

--uu uuuu

OPTION

—

1111 1111

TRIS

—

--11 1111

EECON

21h

---0 x000

---0 q000

EEDATA

25h

xxxx xxxx

uuuu uuuu

EEADR

26h

--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.

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

PIC12F519-E/MS Datasheet(PDF) 43 Page - Microchip Technology

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