參數(shù)資料
型號(hào): PIC16C505
廠商: Microchip Technology Inc.
英文描述: 14-Pin, 8-Bit CMOS Microcontroller(每個(gè)I/O口有25mA驅(qū)動(dòng)/吸收電流,12個(gè)I/O口,帶WDT的微控制器)
中文描述: 14引腳,8位CMOS微控制器(每個(gè)的I / O口有25毫安驅(qū)動(dòng)/吸收電流,12個(gè)的I / O口,帶看門(mén)狗的微控制器)
文件頁(yè)數(shù): 14/80頁(yè)
文件大?。?/td> 617K
代理商: PIC16C505
PIC16C505
DS40192A-page 14
Preliminary
1998 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,
bits and set the Z bit. This leaves the STATUS register
as
000u u1uu
(where
u
= unchanged).
It is recommended, therefore, that only
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
Instruction Set Summary.
CLRF STATUS
will clear the upper three
BCF
,
BSF
and
FIGURE 4-3:
STATUS REGISTER (ADDRESS:03h)
R/W-0
RBWUF
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:
RBWUF
: IO reset bit
1 = Reset due to 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)
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.
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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