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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： | 26/57頁 |
| 文件大小： | 372K |
| 代理商： | W921C880 |
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W921E880A/W921C880
- 26 -
The format of the Timer 0 Control Register is described as follows:
TM0CR REG: (ADDRESS = 020H)
(Default data = 0H)
b3
b2
b1
b0
b1
b0
Input frequency
0
0
0
1
1
0
1
1
fsys/2 Hz
fsys/256 Hz
fsys/1024 Hz
fsys/2048 Hz
Reserved
Reserved
(fsys0)
The format of the Timer 0 Low Speed Register is described as follows:
TM0LSR REG: (ADDRESS = 024H)
(Default data = 0H)
b3
b2
b1
b0
b1
b0
Input frequency (fsys1)
0
0
0
1
1
0
1
1
fsub/2 Hz
fsub/8 Hz
fsub/16 Hz
fsub/32 Hz
Reserved
Reserved
The Timer 0 Set REG. is divided into TIMER 0 MSB DATA REG.(TM0MSB REG, ADDRESS = 021H,
Default = 0FH) and TIMER 0 LSB DATA REG.(TM0LSB REG, ADDRESS = 022H, Default = 0FH).
Timer 0 will underflow when Timer 0 Set REG. goes from 00H to 0FFH. The value in the TM0MSB
and TM0LSB will be auto reloaded to the Timer 0 Set REG. when the STTM0 bit2 is set. Timer 0 will
decrease by 1 continuously during each clock transition after the timer has started.
At any time, if the STTM0 bit3 goes from 0 to 1 (disable to enable) in the timer mode, the TM0MSB
and TM0LSB will be auto reloaded to the Timer 0 Set Reg. again and the Timer 0 is restarted. Timer
0 will stop operating while the STTM0 bit3 is reset to 0.
The Timer 0 starts to count when the STTM0 REG. bit3 is set. When Timer 0 underflows, the STTM0
bit3 will be reset by hardware to stop Timer 0 if the auto-reload is disabled, but the STTM0 bit3 will
not be reset if the auto-reload is enabled.
When the Timer 0 function is performed, the watch-dog timer function will be disabled automatically.
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相關代理商/技術參數 |
參數描述 |
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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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