10F200 datasheet(44/96 Pages) MICROCHIP

44 / 96 page

PIC10F200/202/204/206

DS41239D-page 42

9.2

Oscillator Configurations

9.2.1

OSCILLATOR TYPES

The PIC10F200/202/204/206 devices are offered with

Internal Oscillator mode only.

• INTOSC: Internal 4 MHz Oscillator

9.2.2

INTERNAL 4 MHz OSCILLATOR

The internal oscillator provides a 4 MHz (nominal) system

clock (see Section 12.0 “Electrical Characteristics” for

information on variation over voltage and temperature).

In addition, a calibration instruction is programmed into

the last address of memory, which contains the calibra-

tion value for the internal oscillator. This location is

always uncode protected, regardless of the code-pro-

tect settings. This value is programmed as a MOVLW xx

instruction where xx is the calibration value and is

placed at the Reset vector. This will load the W register

with the calibration value upon Reset and the 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.

9.3

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

• Wake-up from Sleep 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 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, GPWUF and CWUF 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 9-1 for a full description of Reset

states of all registers.

TABLE 9-1:

RESET CONDITIONS FOR REGISTERS – PIC10F200/202/204/206

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.

Address

Power-on Reset

MCLR Reset, WDT Time-out,

Wake-up On Pin Change, Wake 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

00-1 1xxx

q00q quuu(2)

STATUS(3)

03h

00-1 1xxx

qq0q quuu(2)

FSR

04h

111x xxxx

111u uuuu

OSCCAL

05h

1111 1110

uuuu uuuu

GPIO

06h

---- xxxx

---- uuuu

CMCON(3)

07h

1111 1111

uuuu uuuu

OPTION

—

1111 1111

TRISGPIO

—

---- 1111

Legend:

= 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 9-2 for Reset value for specific conditions.

PIC10F204/206 only.

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