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參數(shù)資料
| 型號： | W81C280 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | USB Keyboard/ Device Controller(具有通用串行總線接口的鍵盤／設(shè)備控制器) |
| 中文描述： | 8-BIT, MROM, MICROCONTROLLER, PDIP40 |
| 封裝： | DIP-40 |
| 文件頁數(shù)： | 21/27頁 |
| 文件大小： | 328K |
| 代理商： | W81C280 |
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W81C280
Publication Release Date: July 1997
- 17 -
Revision 0.50
6.6.2 Warm Reset
W81C280 provides a warm reset by programming
a 1 to
bit 6 of control register 0.
6.6.3 USB Reset
The W81C280 handles the USB reset function independently from the CPU core. If a Single Ended
Zero (SE0) is detected on the upstream port for greater then 2.5us, then the interrupt is enabled. The
CPU core read flag from bit2 of status register 0 and t reset the device address to 0, and enter the
active state.
6.7 USB SUSPEND
If there is no upstream activity for 3msec then the SUSPEND flag is set and the interrupt enabled.
When SUSPEND flag is read by CPU core, The W81C280 go into suspend
6.8 USB RESUME:
The suspend mode can be disabled by a 'resume'. The resume can occur by four methods.
The host can send a resume to all ports by placing a 0 (K state) on the bus. The W81C280 sees
the resume, disables the SUSPEND flag, and enables the interrupt. In this case, the CPU core
does not have to perform any functions.
The host can reset the bus.
When any key in Keyboard is press The CPU core can initiate a resume by setting URESUME in
the Control Register which will cause a K state to be sent. To un-resume, the CPU core must clear
the URESUME bit in the Control Register.
6.9 FULL/LOW SPEED DEVICE DETECTION:
The W81C280 detects if upstream port is full speed (FS) or low speed (LS) and sets the appropriate
flag. the CPU core has to configure it as a FS or LS device
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| W81E381 | FULL SPEED USB INTEGRATED MICROCONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
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| W81E381 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:FULL SPEED USB INTEGRATED MICROCONTROLLER |
| W81E381AD | 制造商:WINBOND 制造商全稱:Winbond 功能描述:FULL SPEED USB INTEGRATED MICROCONTROLLER |
| W81E381D | 制造商:WINBOND 制造商全稱:Winbond 功能描述:FULL SPEED USB INTEGRATED MICROCONTROLLER |
| W-82 | 制造商:Hozan Tool Industrial Co Ltd 功能描述: 制造商:Curtis Industries 功能描述:DIN RAIL SLOTTED |
| W820 | 制造商:LUMINIS 制造商全稱:LUMINIS 功能描述:Post top mount |
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