w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 80

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

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:
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
Bit 4: Interrupt request enable. When this bit is set to a high level, it may be used to enable interrupt
Bit 3: This bit is inverted and output to the SLIN# output.
Bit 2: This bit is output to the
Bit 1: This bit is inverted and output to the
Bit 0: This bit is inverted and output to the
valid in all other modes.
0
1
requests from the parallel port to the CPU due to a low to high transition on the
0
1
the parallel port is in output mode.
the parallel port is in input mode.
The printer is not selected.
The printer is selected.
7
INIT#
1
6
1
output.
5
AFD#
STB#
4
-71 -
3
output.
output.
2
1
0
Publication Release Date: March 1999
strobe
autofd
nInit
SelectIn
ackIntEn
Direction
W83977EF/ CTF
PRELIMINARY
ACK#
Revision A1
input.