W83977F Datasheet, PDF (138/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
10.3 Logical Device 1 (Parallel Port)
PRELIMINARY
CR30 (Default 0x01 when PNPCSV=0 at POR)
Bit 7-1 : Reserved.
Bit 0 :
= 1 Activates the logical device.
= 0 Logical device is inactive.
CR31
Bit 7-2 : Reserved.
Bit 1 : ENRNGCK -- > Enable I/O Range check
Bit 0 : FORIORD --> Forces LDN to respond I/O read
CR60, CR 61 (Default 0x03, 0x78 at PNPCSV=0)
These two registers select Parallel Port I/O base address.
[0x100:0xFFC] on 4 byte boundaries(EPP not supported) or
[0x100:0xFF8] on 8 byte boundaries(all modes supported, EPP is only available when the base
address is on an 8byte boundary).
CR70 (Default 0x07 when PNPCSV=0 at POR)
Bit 7-4 : Reserved.
Bit [3:0] : These bits select IRQ resource for Parallel Port.
CR71 (Default 0x02, read only)
Bit 7-2 : Reserved.
Bit 1 : IRQLEV -- > IRQ Level
= 1: High; = 0: Low
Bit 0 : IRQTYPE --> IRQ Type
= 1: Level trigger; = 0: Edge trigger
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Publication Release Date: March 1998
Revision 0.58