參數(shù)資料
型號(hào)： AT7601FG
廠商： AME, Inc.
英文描述： Printer Port Controller
中文描述： 打印機(jī)端口控制器
文件頁(yè)數(shù)： 7/35頁(yè)
文件大?。?/td> 195K
代理商： AT7601FG
AME, Inc.
7
AT7601F
Printer Port Controller
Rev. B.02
Bit 0 TMout: TIME OUT
The bit is valid in EPP mode only and indicates that a 10 uSec 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. This bit is cleared by a RESET. Writing a one to this bit clears
the time out status bit. On a write, this bit is self clearing and does not require a write of a zero. Writing a
zero to this bit has no effect.
5-2-2 Printer Control Port ADDRESS PORT = 02H
The Control Port is located at an offset of '02H" from the base address. The Control Register is initialized by
the RESET input, bits 0 to 5 only being affected; bits 6 and 7 are Logic High.
STROBE
INIT
SLCT IN
DIR
IRQ ENABLE
7
5
6
4
3
2
1
0
1
1
AUTO FD
Bit 6 and 7
These tow bits are Logic High during a read, and cannot be written.
Bit 5 PDIR (PARALLEL DIRECTION CONTROL)
Parallel Direction Control is not valid in printer mode. In printer mode, the direction is always out regardless
of the state of this bit. In bi-directional, EPP or ECP mode, A logic 0 means that the printer port is in output
mode (write); A logic 1 means that the printer port is in input mode (read).
Bit 4 IRQEn (INTERRUPT REQUEST ENABLE)
The interrupt request enable bit when set to a high level may be used to enable interrupt requests from the
Parallel Port to the CPU. An interrupt request is generated on the IRQ port by a positive going ACK# input.
When the IRQEn bit is programmed low the IRQ is disabled.
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