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| 型號： | P12C508 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8-Pin, 8-Bit CMOS Microcontroller |
| 中文描述： | 8引腳，8位CMOS微控制器 |
| 文件頁數(shù)： | 14/84頁 |
| 文件大?。?/td> | 526K |
| 代理商： | P12C508 |
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PIC12C5XX
DS40139A-page 14
Advance Information
1996 Microchip Technology Inc.
4.3
STATUS Register
This register contains the arithmetic status of the ALU,
the RESET status, and the page preselect bit for
program memories larger than 512 words.
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).
It is recommended, therefore, that only
BCF
,
BSF
and
MOVWF
instructions be used to alter the STATUS
register because these instructions do not affect the Z,
DC or C bits from the STATUS register. For other
instructions, which do affect STATUS bits, see Table 8-
2, Instruction Set Summary.
FIGURE 4-4:
STATUS REGISTER (ADDRESS:03h)
R/W-0
GPWUF
bit7
R/W-0
—
6
R/W-0
PA0
5
R-1
TO
4
R-1
PD
3
R/W-x
Z
2
R/W-x
DC
1
R/W-x
C
R = Readable bit
W = Writable bit
- n = Value at POR reset
bit0
bit 7:
GPWUF
: GPIO reset bit
1 = Reset from wake-up from SLEEP on pin change
0 = After power up or other reset
bit 6:
Unimplemented
bit 5:
PA0
: Program page preselect bits
1 = Page 1 (200h - 3FFh) - PIC12C509
0 = Page 0 (000h - 1FFh) - PIC12C508 and PIC12C509
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.
bit 4:
TO
: Time-out bit
1 = After power-up,
CLRWDT
instruction, or
SLEEP
instruction
0 = A WDT time-out occurred
bit 3:
PD
: Power-down bit
1 = After power-up or by the
CLRWDT
instruction
0 = By execution of the
SLEEP
instruction
bit 2:
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
bit 1:
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
bit 0:
C
: Carry/borrow bit (for
ADDWF
,
SUBWF
and
RRF
,
RLF
instructions)
ADDWF
1 = A carry occurred
0 = A carry did not occur
SUBWF
1 = A borrow did not occur
0 = A borrow occurred
RRF or RLF
Load bit with LSB or MSB, respectively
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