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參數(shù)資料
型號(hào): W77E058A
廠商: WINBOND ELECTRONICS CORP
元件分類: 8位微控制器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁數(shù): 29/87頁
文件大?。?/td> 594K
代理商: W77E058A
W77E058A
Publication Release Date: April 17, 2007
- 29 -
Revision A10
8. INSTRUCTION
The W77E058 executes all the instructions of the standard 8032 family. The operation of these
instructions, their effect on the flag bits and the status bits is exactly the same. However, timing of
these instructions is different. The reason for this is two fold. Firstly, in the W77E058, each machine
cycle consists of 4 clock periods, while in the standard 8032 it consists of 12 clock periods. Also, in the
W77E058 there is only one fetch per machine cycle i.e. 4 clocks per fetch, while in the standard 8032
there can be two fetches per machine cycle, which works out to 6 clocks per fetch.
The advantage the W77E058 has is that since there is only one fetch per machine cycle, the number
of machine cycles in most cases is equal to the number of operands that the instruction has. In case
of jumps and calls there will be an additional cycle that will be needed to calculate the new address.
But overall the W77E058 reduces the number of dummy fetches and wasted cycles, thereby
improving efficiency as compared to the standard 8032.
Table 2. Instructions that affect Flag settings
INSTRUCTION
CARRY
OVERFLOW
AUXILIARY
CARRY
INSTRUCTION
CARRY
OVERFLOW
AUXILIARY
CARRY
ADD
X
X
X
CLR C
0
ADDC
X
X
X
CPL C
X
SUBB
X
X
X
ANL C, bit
X
MUL
0
X
ANL C, bit
X
DIV
0
X
ORL C, bit
X
DA A
X
ORL C, bit
X
RRC A
X
MOV C, bit
X
RLC A
X
CJNE
X
SETB C
1
A "X" indicates that the modification is as per the result of instruction.
Table 3. Instruction Timing for W77E058
INSTRUCTION
HEX
OP-CODE
BYTES
W77E058
MACHINE
CYCLES
1
1
1
1
1
1
1
1
1
1
1
2
2
W77E058
CLOCK
CYCLES
4
4
4
4
4
4
4
4
4
4
4
8
8
8032
CLOCK
CYCLES
12
12
12
12
12
12
12
12
12
12
12
12
12
W77E058 VS.
8032 SPEED
RATIO
3
3
3
3
3
3
3
3
3
3
3
1.5
1.5
NOP
ADD A, R0
ADD A, R1
ADD A, R2
ADD A, R3
ADD A, R4
ADD A, R5
ADD A, R6
ADD A, R7
ADD A, @R0
ADD A, @R1
ADD A, direct
ADD A, #data
00
28
29
2A
2B
2C
2D
2E
2F
26
27
25
24
1
1
1
1
1
1
1
1
1
1
1
2
2
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