10F222 datasheet(17/86 Pages) MICROCHIP

17 / 86 page

DS41270E-page 15

PIC10F220/222

TABLE 4-1:

SPECIAL FUNCTION REGISTER (SFR) SUMMARY

4.4

STATUS Register

This register contains the arithmetic status of the ALU,

the Reset status and the page preselect bit.

The STATUS register can be the destination for any

instruction, as with any other register. If the STATUS

the Z, DC or C bits, then the write to these three bits is

disabled. These bits are set or cleared according to the

device logic. Furthermore, the TO and PD bits are not

writable. Therefore, the result of an instruction with the

STATUS register as destination may be different than

intended.

For example, CLRF STATUS will clear the upper three

bits and set the Z bit. This leaves the STATUS register

as 000u u1uu (where u = unchanged).

Therefore, it is recommended that only BCF, BSF and

MOVWF

instructions be used to alter the STATUS regis-

ter. These instructions do not affect the Z, DC or C bits

from the STATUS register. For other instructions, which

do affect Status bits, see Instruction Set Summary.

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

Power-On

Reset(2)

Page #

00h

INDF

Uses contents of FSR to address data memory (not a physical register)

xxxx xxxx

01h

TMR0

8-Bit Real-Time Clock/Counter

xxxx xxxx

02h

PCL(1)

Low Order 8 Bits of PC

1111 1111

03h

STATUS

GPWUF

—

—TO

ZDC

0--1 1xxx

(3)

04h

FSR

Indirect Data Memory Address Pointer

111x xxxx

05h

OSCCAL

CAL6

CAL5

CAL4

CAL3

CAL2

CAL1

CAL0

FOSC4

1111 1110

06h

GPIO

—

GP3

GP2

GP1

GP0

---- xxxx

07h

ADCON0

ANS1

ANS0

—

CHS1

CHS0

GO/DONE

ADON

11-- 1100

08h

ADRES

Result of Analog-to-Digital Conversion

xxxx xxxx

N/A

TRISGPIO

—

I/O Control Register

---- 1111

N/A

OPTION

GPWU

GPPU

T0CS

T0SE

PSA

PS2

PS1

PS0

1111 1111

Legend:

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

Note

The upper byte of the Program Counter is not directly accessible. See Section 4.7 “Program Counter” for an

explanation of how to access these bits.

Other (non Power-up) Resets include external Reset through MCLR, Watchdog Timer and wake-up on pin change

Reset.

See Table 8-1 for other Reset specific values.

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