參數(shù)資料
型號(hào)： W77IE58
廠商： WINBOND ELECTRONICS CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8-BIT, FLASH, 25 MHz, MICROCONTROLLER, PDIP40
封裝： DIP-40
文件頁(yè)數(shù)： 76/90頁(yè)
文件大?。?/td> 409K
代理商： W77IE58
Preliminary W77IE58
- 76 -
MOV
MOV
MOV
TA, #0AAh
TA, #055h
WDCON, #00h 3 M/C
3 M/C
3 M/C
Note: M/C = Machine Cycles
Example 2: Valid access
MOV
MOV
NOP
SETB EWT
TA, #0AAh
TA, #055h
3 M/C
3 M/C
1 M/C
2 M/C
Example 3: Invalid access
MOV
MOV
NOP
NOP
CLR
TA, #0AAh
TA, #055h
POR
3 M/C
3 M/C
1 M/C
1 M/C
2 M/C
Example 4: Invalid Access
MOV
NOP
MOV
SETB EWT
TA, #0AAh
TA, #055h
3 M/C
1 M/C
3 M/C
2 M/C
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.
ON-CHIP FLASH ROM CHARACTERISTICS
The W77IE58 has several modes to program the on-chip Flash 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 V
PP
(
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.
Read Operation
This operation is supported for customer to read their code and the Security bits. The data will not be
valid if the Lock bit is programmed to low.
Output Disable Condition
When the
OE
is set to high, no data output appears on the D7..D0.
Program Operation
This operation is used to program the data to FLASH ROM and the security bits. Program operation is
done when the V
PP
is reach to V
CP
(12.5V) level,
CE
set to low, and
OE
set to high.
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W77L32 8-BIT MICROCONTROLLER
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W77IE58_06 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
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