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參數資料
型號: W83877TF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設及接口
英文描述: Multi-Function I/O Port Controller(用于個人計算機的多功能輸入/輸出口控制器)
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封裝: QFP-100
文件頁數: 56/154頁
文件大小: 821K
代理商: W83877TF
W83877TF
Publication Release Date: March 1998
- 52 -
Version 0.61
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: A 1 means the printer has detected the end of paper.
Bit 4: A 1 means the printer is selected.
Bit 3: A 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.
4.2.3 Printer Control Latch and Printer Control Swapper
The system microprocessor can read the contents of the printer control latch by reading the printer
control swapper. Bit definitions are as follows:
1
1
1
2
3
4
5
6
7
0
STROBE
AUTO FD
INIT
SLCT IN
IRQ ENABLE
DIR
Bit 7, 6: These two bits are a logic one during a read. They can be written.
Bit 5: Direction control bit
When this bit is a logic 1, the parallel port is in input mode (read); when it is a logic 0, the
parallel port is in output mode (write). This bit can be read and written. In SPP mode, this bit is
invalid and fixed at zero.
Bit 4: A 1 in this position allows an interrupt to occur when
ACK
changes from low to high.
Bit 3: A 1 in this bit position selects the printer.
Bit 2: A 0 starts the printer (50 microsecond pulse, minimum).
Bit 1: A 1 causes the printer to line-feed after a line is printed.
Bit 0: A 0.5 microsecond minimum high active pulse clocks data into the printer. Valid data must be
present for a minimum of 0.5 microseconds before and after the strobe pulse.
相關PDF資料
PDF描述
W83971D AC97 AUDIO CODEC
W83977AF PLUG & PLAY 1.0A COMPLIANT
W83977EF WINBOND I/O
W83977F PLUG & PLAY 1.0A COMPLIANT
W83977TF-AW I/O chip disk drive adapter
相關代理商/技術參數
參數描述
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W83977A 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O