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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 |
| 文件頁數(shù)： | 14/35頁 |
| 文件大?。?/td> | 195K |
| 代理商： | AT7601FG |
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AME, Inc.
14
Printer Port Cotroller
AT7601F
Rev. B.02
5-3-1.2 Device Status Register (DSR)
The Status Port is located at an offset of '01H'from the base address. Bits 0-2 are not implemented as
register bits; during a read of the Printer Status Register these bits are a low level. The bits of the Status
Port are defined as follows:
Bit 0-2
: the Status Port is located at an offset of '01H'from the base address. Bits 0-2 are not imple-
mented as register bits; during a read of the Printer Status Register these bits are a low level.
Bit 3 Fault# :
The level on the Fault# input is read by the CPU as bit 3 of the Device Status Register.
Bit 4 SLCT:
The level on the Select input is read by the CPU as bit 4 of the Device Status Register.
Bit 5 PError:
The level on the PError input is read by the CPU as bit 5 of the Device Status Register.
Printer Status Register.
Bit 6 ACK#:
The level on the ACK# input is read by the CPU as bit 6 of the Device Status Register.
Bit 7 BUSY#:
This complement of the level on the BUSY input is read by the CPU as bit 7 of the Device
Status Register.
5-3-1.3 Device Control Register (DCR)
The Control Register is located at an offset of '02H'from the base address. The Control Register is
initialized to zero by the RESET input, bits 0 to 5 only being affected; bits 6 and 7 are hard wired low.
Bit 6 and 7
during a read are a low level, and cannot be written.
Bit 5 PDIR:
If mode=000 or mode=010, this bit has no effect and the direction is always out regardless of the state of
this bit. In all other modes, Direction is valid and 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 AckIntEn-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 due to a low to high
transition on the ACK# input. Refer to the description of the interrupt under Operation, Interrupts.
Bit 3
SLIN
: This bit is inverted and output onto the SLIN# output. A logic 1 on this bit selects the printer;
a logic 0 means the printer is not selected.
Bit 2
INIT#
(INITIATE OUTPUT):
This bit is output onto the INIT# output without inversion.
Bit 1
AFD
(AUTOFEED):
This bit is inverted and output onto the AFD# output. A logic 1 causes the printer to generate a line feed
after each line is printed. A logic 0 means no autofeed.
Bit 0
STB
(STROBE):
This bit is inverted and output onto the STROBE# output.
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