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參數(shù)資料
型號: W83977TF
廠商: WINBOND ELECTRONICS CORP
英文描述: Multi-Function I/O Port Controller(用于個(gè)人計(jì)算機(jī)的多功能輸入/輸出口控制器)
中文描述: 多功能I / O端口控制器(用于個(gè)人計(jì)算機(jī)的多功能輸入/輸出口控制器)
文件頁數(shù): 67/160頁
文件大?。?/td> 1012K
代理商: W83977TF
W83977TF
PRELIMINARY
Publication Release Date: March 1998
- 58 -
Revision 0.62
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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