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參數資料
| 型號： | W77E468 |
| 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： | 41/84頁 |
| 文件大小： | 531K |
| 代理商： | W77E468 |
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Preliminary W77E468
Publication Release Date: January 1999
- 41 - Revision A1
Machine cycles in standard 8032 = 10 + (26 * CNT)
Machine cycles in W77E468 = 10 + (26 * CNT)
If CNT = 50
Clock cycles in standard 8032 = ((10 + (26 *50)) * 12 = (10 + 1300) * 12 = 15720
Clock cycles in W77E468 = ((10 + (26 * 50)) * 4 = (10 + 1300) * 4 = 5240
Block Move with Two Data Pointers in W77E468:
; SH and SL are the high and low bytes of Source Address
; DH and DL are the high and low bytes of Destination Address
; CNT is the number of bytes to be moved
Machine cycles of W77E468
#
2
2
3
2
3
MOV
MOV
MOV
INC
MOV
LOOP:
MOVX A, @DPTR
INC
DPTR
DEC
DPS
MOVX @DPTR, A
INC
DPTR
INC
DPS
DJNZ
R2, LOOP
Machine cycles in W77E468 = 12 + (15 * CNT)
If CNT = 50
Clock cycles in W77E468 = (12 + (15 * 50)) * 4 = (12 + 750) * 4 = 3048
R2, #CNT
DPS, #00h
DPTR, #DHDL ; Load DPTR with Destination address
DPS
; Set DPS to point to DPTR1
DPTR, #SHSL ; Load DPTR1 with Source address
; Load R2 with the count value
; Clear DPS to point to DPTR
; Get data from Source block
; Increment source address
; Clear DPS to point to DPTR
; Write data to Destination
; Increment destination address
; Set DPS to point to DPTR1
; Check if all done
2
2
2
2
2
2
3
We can see that in the first program the standard 8032 takes 15720 cycles, while the W77E468 takes
only 5240 cycles for the same code. In the second program, written for the W77E468, program
execution requires only 3048 clock cycles. If the size of the block is increased then the saving is even
greater.
External Data Memory Access Timing:
The timing for the MOVX instruction is another feature of the W77E468. In the standard 8032, the
MOVX instruction has a fixed execution time of 2 machine cycles. However in the W77E468, the
duration of the access can be varied by the user.
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| W77E516 | 8-BIT MICROCONTROLLER |
| W77E516-25 | 8-BIT MICROCONTROLLER |
| W77E516-40 | 8-BIT MICROCONTROLLER |
| W77E516F-25 | 8-BIT MICROCONTROLLER |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W77E468F-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77E468F-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77E516 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
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