參數(shù)資料
型號： pic16cr54c
廠商： Microchip Technology Inc.
英文描述： ROM-Based 8-Bit CMOS Microcontroller Series(8位CMOS微控制器)
中文描述： 基于ROM的8位CMOS微控制器系列（8位的CMOS微控制器）
文件頁數(shù)： 15/84頁
文件大?。?/td> 654K
代理商： PIC16CR54C
1998 Microchip Technology Inc.
Preliminary
DS40191A-page 15
PIC16CR54C
4.3
STATUS Register
This register contains the arithmetic status of the ALU,
the RESET status, and the page preselect bits 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
Section 8.0, Instruction Set Summary.
FIGURE 4-3:
STATUS REGISTER (ADDRESS:03h)
R/W-0
PA2
bit7
R/W-0
PA1
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:
PA2
: This bit unused at this time.
Use of the PA2 bit as a general purpose read/write bit is not recommended, since this may affect upward
compatibility with future products.
bit 6-5:
Not Applicable
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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