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參數資料
| 型號： | W921C880 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-Bit Microcontroller(4位微控制器) |
| 中文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁數： | 39/57頁 |
| 文件大小： | 372K |
| 代理商： | W921C880 |
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W921E880A/W921C880
Publication Release Date: September 1998
- 39 -
Revision A2
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 W921E880A 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
L
1: f1 = f , f2 = f
L
6.15 Reset
1. Reset by
RESET
256 machine
cycle
Reset all
control reg.
Program executed from
address 000H
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.
2. Reset by Watch Dog Timer
Reset all control
regs except
STTM0.1.
256 machine
cycle
STTM0.1
Program executed from
address 000H
As watch dog timer underflows, the STTM0.1 is set, in the mean while, 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 done before.
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相關代理商/技術參數 |
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| W921E400 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W921E400A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W921E840 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W921E840A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W921E843A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
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