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參數資料
| 型號： | W77LE58 |
| 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： | 43/81頁 |
| 文件大?。?/td> | 657K |
| 代理商： | W77LE58 |
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Preliminary W77LE58
Publication Release Date: August 1999
- 43 - Revision A1
Wait State Control Signal
Either with the software using stretch value to change the required machine cycle of MOVX
instruction, the W77LE58 provides another hardware signal
WAIT
to implement the wider duration of
external data access timing. This wait state control signal is the alternate function of P4.0 such that it
can only be invoked to 44-pin PLCC/QFP package type. The wait state control signal can be enabled
by setting WS (ROMMAP.7) bit. When enabled, the setting of stretch value decides the minimum
length of MOVX instruction cycle and the device will sample the
WAIT
pin at each C3 state before
the rising edge of read/write strobe signal during MOVX instruction. Once this signal being
recongnized, one more machine cycle (wait state cycle) will be inserted into next cycle. The inserted
wait state cycles are unlimited, so the MOVX instruction cycle will end in which the wait state control
signal is deactivated. Using wait state control signal allows a dynamically access timimg to a selected
external peripheral. The WS bit is accessed by the Timed Access Protection procedure.
Wait State Control Signal Timing (when Stretch = 1)
C2 C3 C4
C1
CLOCK
ALE
PSEN
ADDRESS
RD / WR
C2 C3
C4
C1
C2 C3
C4
C1
C2 C3
C4
C1
C2 C3 C4
C1
MOVX Instruction
MCycle
SCycle
Wait-State
Cycle
Third
WAIT
sample
WAIT
sample WAIT
Extended duration
original rising edge
Wait State Control Signal Timing (when Stretch = 2)
C2 C3
C4
C1
CLOCK
ALE
PSEN
ADDRESS
RD / WR
C2 C3
C4
C1
C2 C3
C4
C1
C2 C3
C4
C1
C3
C4
C2
C1
MOVX Instruction
MCycle
SCycle
Wait-State
Cycle
Third
WAIT
sample
WAIT
sample WAIT
Extended duration
original rising edge
C2
C1
Fourth
相關PDF資料 |
PDF描述 |
|---|---|
| W77LE58-25 | 8 BIT MICROCONTROLLER |
| W77LE58F-25 | 8 BIT MICROCONTROLLER |
| W77LE58P-25 | 8 BIT MICROCONTROLLER |
| W78151 | 8-BIT Microcontroller(8位的微控制器) |
| W78L51F-24 | 8-BIT MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W77LE58_07 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77LE58-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77LE58F-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77LE58P-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77M032A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
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