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參數(shù)資料
型號: W77E468F-40
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): 45/84頁
文件大小: 352K
代理商: W77E468F-40
Preliminary W77E468
Publication Release Date: January 1999
- 45 - Revision A1
Next
Instruction
Machine Cycle
Fourth
Machine Cycle
Third
Machine Cycle
Second
Machine Cycle
First
Machine Cycle
Last Cycle
of Previous
Instruction
C4
A15-0
D7-0
WR
PSEN
ALE
CLK
C3
C2
D0-D7
D0-D7
D0-D7
D0-D7
A15-A0
A15-A0
A15-A0
A15-A0
C1
C4
C3
C2
C1
C4
C3
C2
C1
C4
C3
C2
C1
MOVX instruction cycle
Next Inst.
Read
Next Inst.
Address
MOVX Data out
MOVX Data
Address
MOVX Inst.
Address
MOVX Inst.
C4
C3
C2
C1
C4
C3
C2
C1
Figure 10. Data Memory Write with Stretch Value = 2
Wait State Control Signal
Either with the software using stretch value to change the required machine cycle of MOVX
instruction, the W77E468 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 P6.0. 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.
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W77E516 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
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W77E516A40DL 功能描述:IC MCU 8-BIT 64K FLASH 40-DIP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:W77 標(biāo)準(zhǔn)包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI,I²C,UART/USART 外圍設(shè)備:POR,PWM,WDT 輸入/輸出數(shù):40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC(J 形引線) 包裝:帶卷 (TR)