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參數(shù)資料
| 型號： | PIC12F510 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8/14-Pin, 8-Bit Flash Microcontroller |
| 中文描述： | 8/14-Pin，8位閃存微控制器 |
| 文件頁數(shù)： | 20/114頁 |
| 文件大?。?/td> | 908K |
| 代理商： | PIC12F510 |
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PIC12F510/16F506
DS41268B-page 18
Preliminary
2006 Microchip Technology Inc.
4.3
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
Section 11.0 “Instruction
Set Summary”
.
REGISTER 4-1:
STATUS REGISTER (ADDRESS: 03h) (PIC12F510)
R/W-0
R/W-0
GPWUF
CWUF
bit 7
R/W-0
PA0
R-1
TO
R-1
PD
R/W-X
Z
R/W-X
DC
R/W-X
C
bit 0
bit 7
GPWUF
: GPIO Reset bit
1
= Reset due to wake-up from Sleep on pin change
0
= After power-up or other Reset
CWUF
:
Comparator Reset bit
1
= Reset due to wake-up from Sleep on comparator change
0
= After power-up or other Reset
PA0
: Program Page Preselect bit
1
= Page 1 (200h-3FFh)
0
= Page 0 (000h-1FFh)
Each page is 512 bytes.
Using the PA0 bit as a general purpose read/write bit in devices which do not use it for program page
preselect is not recommended, since this may affect upward compatibility with future products.
TO
: Time-out bit
1
= After power-up,
CLRWDT
instruction, or
SLEEP
instruction
0
= A WDT time-out occurred
PD
: Power-down bit
1
= After power-up or by the
CLRWDT
instruction
0
= By execution of the
SLEEP
instruction
Z
: Zero bit
1
= The result of an arithmetic or logic operation is zero
0
= The result of an arithmetic or logic operation is not zero
DC
: Digit carry/borrow bit (for
ADDWF
and
SUBWF
instructions)
ADDWF:
1
= A carry from the 4th low-order bit of the result occurred
0
= A carry from the 4th low-order bit of the result did not occur
SUBWF:
1
= A borrow from the 4th low-order bit of the result did not occur
0
= A borrow from the 4th low-order bit of the result occurred
C
: Carry/borrow bit (for
ADDWF
,
SUBWF
and
RRF
,
RLF
instructions)
ADDWF:
SUBWF:
1
= A carry occurred
1
= A borrow did not occur
0
= A carry did not occur
0
= A borrow occurred
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
RRF
or
RLF:
Load bit with LSb or MSb, respectively
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
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