參數(shù)資料
型號(hào)： PIC876
廠商： Microchip Technology Inc.
英文描述： 28/40-pin 8-Bit CMOS FLASH Microcontrollers
中文描述： 28/40-pin 8位CMOS閃存微控制器
文件頁(yè)數(shù)： 18/200頁(yè)
文件大小： 3544K
代理商： PIC876
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PIC16F87X
DS30292B-page 18
1999 Microchip Technology Inc.
2.2.2.1
STATUS REGISTER
The STATUS register contains the arithmetic status of
the ALU, the RESET status and the bank select bits for
data memory.
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,
SWAPF
and
MOVWF
instructions are used to alter the
STATUS register, because these instructions do not
affect the Z, C or DC bits from the STATUS register. For
other instructions not affecting any status bits, see the
"Instruction Set Summary."
REGISTER 2-1:
STATUS REGISTER (ADDRESS 03h, 83h, 103h, 183h)
Note 1:
The C and DC bits operate as a borrow
and digit borrow bit, respectively, in sub-
traction. See the
SUBLW
and
SUBWF
instructions for examples.
R/W-0
IRP
bit7
R/W-0
RP1
R/W-0
RP0
R-1
TO
R-1
PD
R/W-x
Z
R/W-x
DC
R/W-x
C
bit0
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n= Value at POR reset
bit 7:
IRP:
Register Bank Select bit (used for indirect addressing)
1
= Bank 2, 3 (100h - 1FFh)
0
= Bank 0, 1 (00h - FFh)
bit 6-5:
RP1:RP0
: Register Bank Select bits (used for direct addressing)
11
= Bank 3 (180h - 1FFh)
10
= Bank 2 (100h - 17Fh)
01
= Bank 1 (80h - FFh)
00
= Bank 0 (00h - 7Fh)
Each bank is 128 bytes
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 (
ADDWF
,
ADDLW,SUBLW,SUBWF
instructions)
(for borrow the polarity is reversed)
1
= A carry-out from the 4th low order bit of the result occurred
0
= No carry-out from the 4th low order bit of the result
bit 0:
C
: Carry/borrow bit (
ADDWF
,
ADDLW,SUBLW,SUBWF
instructions)
1
= A carry-out from the most significant bit of the result occurred
0
= No carry-out from the most significant bit of the result occurred
Note:
For borrow the polarity is reversed. A subtraction is executed by adding the two’s complement of
the second operand. For rotate (
RRF
,
RLF
) instructions, this bit is loaded with either the high or low order
bit of the source register.
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