PIC16C926-I/CL Microchip Technology, PIC16C926-I/CL Datasheet - Page 21
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PIC16C926-I/CL
Manufacturer Part Number
PIC16C926-I/CL
Description
64/68-Pin CMOS Microcontrollers with LCD Driver
Manufacturer
Microchip Technology
Datasheet
1.PIC16C926-ICL.pdf
(182 pages)
- Current page: 21 of 182
- Download datasheet (4Mb)
2.3.1
The STATUS register, shown in Register 2-1, 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.
REGISTER 2-1:
2001 Microchip Technology Inc.
bit 7
bit 6-5
bit 4
bit 3
bit 2
bit 1
bit 0
STATUS REGISTER
STATUS REGISTER (ADDRESS 03h, 83h, 103h, 183h)
IRP: Register Bank Select bit (used for indirect addressing)
1 = Bank 2, 3 (100h - 1FFh)
0 = Bank 0, 1 (00h - FFh)
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)
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 (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
C: Carry/borrow bit (ADDWF, ADDLW,SUBLW,SUBWF instructions)
(for borrow the polarity is reversed)
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
bit 7
Legend:
R = Readable bit
- n = Value at POR
R/W-0
Note:
IRP
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.
R/W-0
RP1
R/W-0
RP0
Preliminary
W = Writable bit
’1’ = Bit is set
R-1
TO
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.”
Note:
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
R-1
PD
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.
PIC16C925/926
R/W-x
Z
x = Bit is unknown
R/W-x
DC
DS39544A-page 19
R/W-x
C
bit 0
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