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參數(shù)資料
| 型號(hào)： | W83977TF(EOL) |
| 英文描述： | W83877TF plus KBC. CIR. RTC |
| 中文描述： | W83877TF加比聯(lián)。稅務(wù)局局長(zhǎng)。時(shí)鐘 |
| 文件頁(yè)數(shù)： | 74/161頁(yè) |
| 文件大?。?/td> | 592K |
| 代理商： | W83977TF(EOL) |
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W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-65 -
Revision A1
5.2.1 Data Swapper
The system microprocessor can read the contents of the printer's data latch by reading the data
swapper.
5.2.2 Printer Status Buffer
The system microprocessor can read the printer status by reading the address of the printer status
buffer. The bit definitions are as follows:
1
1
1
2
3
5
4
6
7
0
TMOUT
ERROR#
SLCT
PE
ACK#
BUSY#
Bit 7: This signal is active during data entry, when the printer is off-line during printing, when the print
head is changing position, or during an error state. When this signal is active, the printer is
busy and cannot accept data.
Bit 6: This bit represents the current state of the printer's
ACK#
signal. A 0 means the printer has
received a character and is ready to accept another. Normally, this signal will be active for
approximately 5
microseconds before
BUSY#
stops.
Bit 5: Logical 1 means the printer has detected the end of paper.
Bit 4: Logical 1 means the printer is selected.
Bit 3: Logical 0 means the printer has encountered an error condition.
Bit 1, 2: These two bits are not implemented and are logic one during a read of the status register.
Bit 0: This bit is valid in EPP mode only. It indicates that a 10
μ
S time-out has occurred on the EPP
bus. A logic 0 means that no time-out error has occurred; a logic 1 means that a time-out error
has been detected. Writing a logic 1 to this bit will clear the time-out status bit; writing a logic 0
has no effect.
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PDF描述 |
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| W83C42 | KEYBOARD CONTROLLER |
| W83C42P | KEYBOARD CONTROLLER |
| W83C45 | Keyboard Controller |
| W83C45P | Keyboard Controller |
| W83C553F-G | W83C553F-G Highly Integrated System I/O Controller for Power PCTM (South Bridge) QFP 208 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W83977TF-P | 制造商:WINBOND 制造商全稱:Winbond 功能描述:I/O chip disk drive adapter |
| W83977TF-PW | 制造商:WINBOND 制造商全稱:Winbond 功能描述:I/O chip disk drive adapter |
| W83C42 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:KEYBOARD CONTROLLER |
| W83C42P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:KEYBOARD CONTROLLER |
| W83C43 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:KEYBOARD CONTROLLER |
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