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參數資料
| 型號： | W921E843A |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT MICROCONTROLLER |
| 中文描述： | 4-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | DIP-40 |
| 文件頁數： | 41/58頁 |
| 文件大小： | 449K |
| 代理商： | W921E843A |
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W921E840A/W921C840
Publication Release Date: July 1999
- 41 - Revision A3
6.14 Initial Condition Register of EPROM Program Method
There is one 4-bit of the initial condition register (not part of the RAM) in W921E840A to control the
micro-controller initial status after power-on. The format is described as following:
INI register: (initial value = 0FH)
b3
b2
b1
b0
0: osc acts as RC oscillator type
1: osc acts as crystal type
Reserved
Reserved
0: f1 = f , f2 = f
H
1: f1 = f , f2 = f
L
only for W921E841A, 843A, 844A
6.15 Reset
W921E840A/W921C840 provides two reset methods, pull low RESETpin and watch dog timer reset.
6.15.1 Reset by
RESET
As RESET pin is pulled low, system and all control registers are reset to initial state. After RESET
pin is in high level, system will delay 256 machine cycle time, then program is executed from address
000H.
6.15.2 Reset by Watch Dog Timer
As watch dog timer underflows, the STTM0.1 is set, in the meantime, system and all control registers,
except data 1 in STTM0.1 bit is reserved, are reset to initial state, then after a delay of 256 machine
cycle time program is executed from address 000H. After system reset, user can detect STTM0.1 to
recognize which method of reset was used before.
256 machine
cycle
Reset all
control reg.
Program executed from
address 000H
Reset all control
regs except
STTM0.1.
256 machine
cycle
STTM0.1
Program executed from
address 000H
相關PDF資料 |
PDF描述 |
|---|---|
| W921C880 | 4-Bit Microcontroller(4位微控制器) |
| W921E880A | 4-Bit Microcontroller(4位微控制器) |
| W921E840 | 4-Bit Microcontroller(4位的微控制器) |
| W921E880 | 4-Bit Microcontroller(4位的微控制器) |
| W921F840 | 4-Bit Microcontroller(4位的微控制器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W921E880 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W921E880A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W925C240 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telephone Controller |
| W925C625 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-bit CID MICROCONTROLLER |
| W925E240 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telephone Controller |
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