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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: 72/84頁
文件大小: 531K
代理商: W77E468
Preliminary W77E468
- 72 -
Examples of Timed Assessing are shown below.
Example 1: Valid access
MOV
TA, #0AAh
MOV
TA, #055h
MOV
WDCON, #00h 3 M/C
3 M/C
3 M/C
Note: M/C = Machine Cycles
Example 2: Valid access
MOV
MOV
NOP
SETB
TA, #0AAh
TA, #055h
3 M/C
3 M/C
1 M/C
2 M/C
EWT
Example 3: Invalid access
MOV
MOV
NOP
NOP
CLR
TA, #0AAh
TA, #055h
3 M/C
3 M/C
1 M/C
1 M/C
2 M/C
POR
Example 4: Invalid Access
MOV
NOP
MOV
SETB
In the first two examples, the writing to the protected bits is done before the 3 machine cycle window
closes. In Example 3, however, the writing to the protected bit occurs after the window has closed,
and so there is effectively no change in the status of the protected bit. In Example 4, the second write
to TA occurs 4 machine cycles after the first write, therefore the timed access window in not opened
at all, and the write to the protected bit fails.
TA, #0AAh
3 M/C
1 M/C
3 M/C
2 M/C
TA, #055h
EWT
ON-CHIP MTP ROM CHARACTERISTICS
The W77E468 has several modes to program the on-chip MTP ROM. All these operations are
configured by the pins RST, ALE, PSEN, A9CTRL(P3.0), A13CTRL(P3.1), A14CTRL(P3.2),
OECTRL(P3.3), CE(P3.6), OE(P3.7), A0(P1.0) and VPP(
EA
). Moreover, the A15
A0(P2.7
P2.0,
P1.7
P1.0) and the D7
D0(P0.7
P0.0) serve as the address and data bus respectively for these
operations.
相關PDF資料
PDF描述
W77E516 8-BIT MICROCONTROLLER
W77E516-25 8-BIT MICROCONTROLLER
W77E516-40 8-BIT MICROCONTROLLER
W77E516F-25 8-BIT MICROCONTROLLER
W77E516F-40 8-BIT MICROCONTROLLER
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