參數(shù)資料
型號: W83977CTF-PW
英文描述: PERIPHERAL (MULTIFUNCTION) CONTROLLER
中文描述: 周邊(多功能)控制器
文件頁數(shù): 80/161頁
文件大小: 592K
代理商: W83977CTF-PW
W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-71 -
Revision A1
Bit 7: This bit reflects the complement of the Busy input.
Bit 6: This bit reflects the nAck input.
Bit 5: This bit reflects the PError input.
Bit 4: This bit reflects the Select input.
Bit 3: This bit reflects the nFault input.
Bit 2-0: These three bits are not implemented and are always logic one during a read.
5.3.4 Device Control Register (DCR)
The bit definitions are as follows:
7 6 5 4 3 2 1 0
1
1
strobe
autofd
nInit
SelectIn
ackIntEn
Direction
Bit 6, 7: These two bits are logic one during a read and cannot be written.
Bit 5: This bit has no effect and the direction is always out if mode = 000 or mode = 010. Direction is
valid in all other modes.
0
the parallel port is in output mode.
1
the parallel port is in input mode.
Bit 4: Interrupt request enable. When this bit is set to a high level, it 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.
Bit 3: This bit is inverted and output to the SLIN#
output.
0
The printer is not selected.
1
The printer is selected.
Bit 2: This bit is output to the
INIT#
output.
Bit 1: This bit is inverted and output to the
AFD#
output.
Bit 0: This bit is inverted and output to the
STB#
output.
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