參數(shù)資料
型號(hào)： M38037M6-XXXFP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 13/135頁(yè)
文件大?。?/td> 2055K
代理商： M38037M6-XXXFP
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13
3803/3804 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
[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
operation and 3 flags which decide MCU operation. Branch opera-
tions 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
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)
When the T flag is
“
0
”
, arithmetic operations are performed
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
M38037M8-XXXFP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M38047M8-XXXFP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M38037M8-XXXHP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M38037M8-XXXSP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M3803 Single Chip 8 Bits Microcomputer(8位單片機(jī))
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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