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參數(shù)資料
| 型號(hào)： | 7643 |
| 英文描述： | IrDA. protocol handler plus endec for DCE Apps, -40C to +85C, 18-SOIC 300mil, TUBE |
| 中文描述： | 7643Group數(shù)據(jù)表數(shù)據(jù)表1369K/JUL.30.03 |
| 文件頁數(shù)： | 10/120頁 |
| 文件大小： | 1369K |
| 代理商： | 7643 |
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Rev.1.00 Jul 30, 2003 page 10 of 119
7643 Group
[Processor status register (PS)]
The processor status register is an 8-bit register consisting of 5 flags
which indicate the status of the processor after an arithmetic opera-
tion and 3 flags which decide MCU operation. Branch operations can
be performed by testing the Carry (C) flag , Zero (Z) flag, Overflow
(V) flag, or the Negative (N) flag. In decimal mode, the Z, V, N flags
are not valid.
Bit 0: Carry flag (C)
The C flag contains a carry or borrow generated by the arithmetic
logic unit (ALU) immediately after an arithmetic operation. It can
also be changed by a shift or rotate instruction.
Bit 1: Zero flag (Z)
The Z flag is set if the result of an immediate arithmetic operation
or a data transfer is “0”, and cleared if the result is anything other
than “0”.
Bit 2: Interrupt disable flag (I)
The I flag disables all interrupts except for the interrupt
generated by the BRK instruction.
Interrupts are disabled when the I flag is “1”.
Bit 3: Decimal mode flag (D)
The D flag determines whether additions and subtractions are
executed in binary or decimal. Binary arithmetic is executed when
this flag is “0”; decimal arithmetic is executed when it is “1”.
Decimal correction is automatic in decimal mode. Only the ADC
and SBC instructions can execute decimal arithmetic.
Bit 4: Break flag (B)
The B flag is used to indicate that the current interrupt was
generated by the BRK instruction. The BRK flag in the processor
status register is always “0”. When the BRK instruction is used to
generate an interrupt, the processor status register is pushed
onto the stack with the break flag set to “1”.
Bit 5: Index X mode flag (T)
between accumulator and memory. When the T flag is “1”, direct
arithmetic operations and direct data transfers are enabled
between memory locations.
Bit 6: Overflow flag (V)
The V flag is used during the addition or subtraction of one byte
of signed data. It is set if the result exceeds +127 to -128. When
the BIT instruction is executed, bit 6 of the memory location
operated on by the BIT instruction is stored in the overflow flag.
Bit 7: Negative flag (N)
The N flag is set if the result of an arithmetic operation or data
transfer is negative. When the BIT instruction is executed, bit 7 of
the memory location operated on by the BIT instruction is stored
in the negative flag.
Table 5 Set and clear instructions of each bit of processor status register
C flag
SEC
CLC
Set instruction
Clear instruction
Z flag
–
–
I flag
SEI
CLI
D flag
SED
CLD
B flag
–
–
T flag
SET
CLT
V flag
–
CLV
N flag
–
–
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 765-11-(SERIES) | Analog IC |
| 765-11-20K | Analog IC |
| 765-11-25A | Analog IC |
| 765-11E | 8 BIT INPUT/OUTPUT EXPANDER, I2C INTERFACE, -40C to +125C, 20-QFN, TUBE |
| 765-11R | 8-bit I/O Expander with I2C Interface., -40C to +125C, 18-SOIC 300mil, TUBE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 764-3"x36yd-Red | 功能描述:膠帶 764 RED 3X36 YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 764-3"x36yd-White | 功能描述:膠帶 WHITE 3X36YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 764-3"x36yd-Yellow | 功能描述:膠帶 764 YELLOW 3X36 YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 7643_06 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER |
| 76430 | 制造商:Brady Corporation 功能描述:TAPE, BARRICADE, BLACK/PHOSPHORESCENT, 2INX5YD; Tape Type:Safety, Hazard Warning; Tape Backing Material:Polyester Film; Tape Width - Metric:50.8mm; Tape Width - Imperial:2"; Tape Length - Metric:4.572m; Tape Length - Imperial:5yard ;RoHS Compliant: NA |
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