Datasheet

Table Of Contents
© 2007 Microchip Technology Inc. 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
register is the destination for an instruction that affects
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 20
01h TMR0 8-Bit Real-Time Clock/Counter xxxx xxxx 25
02h PCL
(1)
Low Order 8 Bits of PC 1111 1111 19
03h STATUS GPWUF
—TOPD ZDCC0--1 1xxx
(3)
15
04h FSR Indirect Data Memory Address Pointer 111x xxxx 20
05h OSCCAL CAL6 CAL5 CAL4 CAL3 CAL2 CAL1 CAL0 FOSC4 1111 1110 18
06h GPIO
GP3 GP2 GP1 GP0 ---- xxxx 21
07h
ADCON0
ANS1 ANS0
CHS1 CHS0 GO/DONE ADON 11-- 1100 30
08h ADRES Result of Analog-to-Digital Conversion xxxx xxxx 31
N/A TRISGPIO
I/O Control Register ---- 1111 23
N/A
OPTION
GPWU
GPPU T0CS T0SE PSA PS2 PS1 PS0 1111 1111 17
Legend: – = unimplemented, read as ‘0’, x = unknown, u = unchanged, q = value depends on condition.
Note 1: 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.
2: Other (non Power-up) Resets include external Reset through MCLR
, Watchdog Timer and wake-up on pin change
Reset.
3: See Table 8-1 for other Reset specific values.