AX88196
Local CPU BUS MAC Controller
4.14 SPP Data Port Register (SPP_DPR) Offset 18H (Read/Write)
FIELD NAME
7:0 DP
DESCRIPTION
Printer Data Port
4.15 SPP Status Port Register (SPP_SPR) Offset 19H (Read)
FIELD NAME
DESCRIPTION
7
6
/BUSY Reading a ‘ 0’ indicates that the printer is not ready to receive new data.
/ACK Reading a ‘ 0’ indicates that the printer has received the data and is ready to accept new data.
5
PE
Reading a ‘ 1’ indicates that the printer is out of paper.
4
SLCT Reading a ‘ 1’ indicates that the printer has power on.
3
/ERR Reading a ‘ 0’ indicates that there is an error condition at the printer.
2:0
-
Reserved
4.16 SPP Command Port Register (SPP_CPR) Offset 1AH (Read/Write)
FIELD NAME
DESCRIPTION
7:6
5
4
-
Reserved
/DOE Seting to ‘ 0’ enable print data output to printer. Default sets to ‘ 1’ .
IRQEN IRQ enable : printer port interrupt is not supportted.
3
SLCTIN Seting to ‘ 1’ selects the printer.
2
/INIT Seting to ‘ 0’ initiates the printer
1
0
ATFD Seting to ‘ 1’ causes the printer to automatically feed one line after each line is printed.
STRB Seting a low-high-low pulse on this register is used to strobe the print data into the printer.
22
ASIX ELECTRONICS CORPORATION
ASIX [ ASIX ELECTRONICS CORPORATION ]
