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參數資料
型號: W79E804A
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: 45/115頁
文件大小: 1456K
代理商: W79E804A
W79E804A/803A/802A
Publication Release Date: July 16, 2007
- 45 -
Revision A2
9. INSTRUCTION SET
The W79E804 series execute all the instructions of the standard 8052 family. The operations of these
instructions, as well as their effects on flag and status bits, are exactly the same. However, the timing
of these instructions is different in two ways. Firstly, the machine cycle is four clock periods, while the
standard-8051/52 machine cycle is twelve clock periods. Secondly, it can fetch only once per machine
cycle (i.e., four clocks per fetch), while the standard 8051/52 can fetch twice per machine cycle (i.e.,
six clocks per fetch).
The timing differences create an advantage for the W79E804 series. There is only one fetch per
machine cycle, so the number of machine cycles is usually equal to the number of operands in the
instruction. (Jumps and calls do require an additional cycle to calculate the new address.) As a result,
the W79E804 series reduces the number of dummy fetches and wasted cycles, and therefore
improves overall efficiency, compared to the standard 8051/52.
OP-CODE
HEX CODE BYTES
W79E804
SERIES
MACHINE
CYCLE
W79E804
SERIES
CLOCK
CYCLES
8032
CLOCK
CYCLES
W79E804
SERIES VS.
8032 SPEED
RATIO
NOP
00
1
1
4
12
3
ADD A, R0
28
1
1
4
12
3
ADD A, R1
29
1
1
4
12
3
ADD A, R2
2A
1
1
4
12
3
ADD A, R3
2B
1
1
4
12
3
ADD A, R4
2C
1
1
4
12
3
ADD A, R5
2D
1
1
4
12
3
ADD A, R6
2E
1
1
4
12
3
ADD A, R7
2F
1
1
4
12
3
ADD A, @R0
26
1
1
4
12
3
ADD A, @R1
27
1
1
4
12
3
ADD A, direct
25
2
2
8
12
1.5
ADD A, #data
24
2
2
8
12
1.5
ADDC A, R0
38
1
1
4
12
3
ADDC A, R1
39
1
1
4
12
3
ADDC A, R2
3A
1
1
4
12
3
ADDC A, R3
3B
1
1
4
12
3
ADDC A, R4
3C
1
1
4
12
3
ADDC A, R5
3D
1
1
4
12
3
ADDC A, R6
3E
1
1
4
12
3
ADDC A, R7
3F
1
1
4
12
3
ADDC A, @R0
36
1
1
4
12
3
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