W83787IF Datasheet, PDF (67/123 Pages) Winbond – WINBOND I/O WITH SERIAL-INFRARED SUPPORT

W83787IF
GMODS (Bit 4):
This bit selects the adapter mode or portable mode.
0
Selects the portable mode. Pins 41 and 39 will function as PFDCEN and PEXTEN
1
Selects the adapter mode. Pins 41 and 39 will function as GMRD and GMWR
EPPVER (Bit 5):
This bit selects the EPP version of parallel port:
0
Selects the EPP 1.9 version
1
Selects the EPP 1.7 version (default)
GMENL (Bit 6):
This bit enables or disables game port.
0
Enables game port
1
Disables game port
PRTBEN (Bit 7):
This bit enables or disables the bi-directional capability of the parallel port in W83757 mode.
1
Disables the bi-directional capability of the parallel port
0
Enables the bi-directional capability of the parallel port. If the PRTOE pin is pulled
high or left floating, then the direction of the parallel port is controlled by bit 5 of the
printer control register (power-on default)
7.2.5 Configuration Register 4 (CR4) EFER = 89H, EFIR = 04H
When 89H is loaded into EFER and 04H is loaded into EFIR, the CR4 register can be accessed
through EFDR. The bit definitions are as follows:
7 6 5 4 32 1 0
Notes:
PRTPWD (Bit 7):
0
Supplies power to the parallel port
1
Puts the parallel port in power-down mode
GMPWD (Bit 6):
0
Supplies power to the game port
1
Puts the game port in power-down mode
URAPWD (Bit 5):
0
Supplies power to COMA
1
Puts COMA in power-down mode
URBPWD (Bit 4):
0
Supplies power to COMB
1
Puts COMB in power-down mode
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URBTRI
URATRI
GMTRI
PRTTRI
URBPWD
URAPWD
GMPWD
PRTPWD
Publication ReleaseDate:Sep 1995
Revision A1