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參數(shù)資料
型號(hào): W77L32
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): 39/74頁
文件大小: 871K
代理商: W77L32
Preliminary W77L32
Publication Release Date: November 2, 2001
- 39 - Revision A1
Machine cycles in standard 8032 = 10 + (26 * CNT)
Machine cycles in W77L32 = 10 + (26 * CNT)
If CNT = 50
Clock cycles in standard 8032= ((10 + (26 *50)) * 12 = (10 + 1300) * 12 = 15720
Clock cycles in W77L32 = ((10 + (26 * 50)) * 4 = (10 + 1300) * 4 = 5240
Block Move with Two Data Pointers in W77L32:
; 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
MOV
R2, #CNT
; Load R2 with the count value
MOV
DPS, #00h
; Clear DPS to point to DPTR
MOV
DPTR, #DHDL ; Load DPTR with Destination address
INC
DPS
; Set DPS to point to DPTR1
MOV
DPTR, #SHSL ; Load DPTR1 with Source address
LOOP:
MOVX A, @DPTR
; Get data from Source block
INC
DPTR
; Increment source address
DEC
DPS
; Clear DPS to point to DPTR
MOVX @DPTR, A
; Write data to Destination
INC
DPTR
; Increment destination address
INC
DPS
; Set DPS to point to DPTR1
DJNZ R2, LOOP
; Check if all done
Machine cycles in W77L32 = 12 + (15 * CNT)
If CNT = 50
Clock cycles in W77L32 = (12 + (15 * 50)) * 4 = (12 + 750) * 4 = 3048
We can see that in the first program the standard 8032 takes 15720 cycles, while the W77L32 takes
only 5240 cycles for the same code. In the second program, written for the W77L32, program
execution requires only 3048 clock cycles. If the size of the block is increased then the saving is even
greater.
Machine cycles of W77L32
#
2
2
3
2
3
2
2
2
2
2
2
3
External Data Memory Access Timing
The timing for the MOVX instruction is another feature of the W77L32. In the standard 8032, the
MOVX instruction has a fixed execution time of 2 machine cycles. However in the W77L32, the
duration of the access can be varied by the user.
The instruction starts off as a normal op-code fetch of 4 clocks. In the next machine cycle, the W77L32
puts out the address of the external Data Memory and the actual access occurs here. The user can
change the duration of this access time by setting the STRETCH value. The Clock Control SFR
(CKCON) has three bits that control the stretch value. These three bits are M2-0 (bits 2-0 of CKCON).
These three bits give the user 8 different access time options. The stretch can be varied from 0 to 7,
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