W83877 Winbond Electronics Corp America, W83877 Datasheet - Page 82

• Manufacturer Part Number: W83877
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

8.2.11 Configuration Register A (CRA), default = 1FH
When the device is in Extended Function mode and EFIR is 0AH, the CRA register can be accessed
through EFDR. The bit definitions are as follows:
PFDCACT (Bit 7):
This bit controls whether PFDCEN (pin 41) is active high or low in portable mode.
PEXTACT (Bit 6):
This bit controls whether PEXTEN (pin 39) is active high or low in portable mode. This pin can also
reflect the mode of the parallel port: EXTADP mode, EPP mode, ECP mode, or ECP/EPP mode, or
any combination of these modes.
Bit 5: Reserved.
PDCACT (Bit 4):
This bit controls whether the PDCIN pin is active high or low.
PEXTADP (Bit 3):
This bit controls whether the PEXTEN pin is active in EXTADP mode.
PEXTEPP (Bit 2):
This bit controls whether the PEXTEN pin is active in EPP mode.
0
1
0
1
0
1
0
1
0
PFDCEN is active low
PFDCEN is active high
PEXTEN is active low
PEXTEN is active high
PDCIN is active low
PDCIN is active high
PEXTEN is not active in EXTADP mode
PEXTEN is active in EXTADP mode
PEXTEN is not active in EPP mode
7
6
5
4
3
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2
1
0
PEXTECPP
PEXT ECP
PEXT EPP
PEXT ADP
PDCACT
PDIRHOP
PEXT ACT
PFDCACT
W83877F