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FDC37C78-HT Datasheet(PDF) 66 Page - Microchip Technology

Part # FDC37C78-HT
Description  Floppy Disk Controller
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

FDC37C78-HT Datasheet(HTML) 66 Page - Microchip Technology

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66
CR02
This register can only be accessed in the Configuration Mode and after the CSR has been initialized
to 02H. The default value of this register after power up is 00H.
Table 36 - CR02
BIT NO.
BIT NAME
DESCRIPTION
0:7
Reserved
Read Only. A read returns a 0.
CR03
This
register
can
only be accessed in the Configuration Mode and the CSR has been initialized
to 03H. The default value after power up is 70H.
Table 37 - CR03
BIT NO.
BIT NAME
DESCRIPTION
0
Reserved
Reserved - Read as zero
1
Enhanced
Floppy Mode
2
Bit 1
Floppy Mode - Refer to the description of the TAPE
DRIVE REGISTER (TDR) for more information on these
modes.
0
NORMAL Floppy Mode (Default)
1
Enhanced Floppy Mode 2 (OS2)
2
Reserved
Reserved - Read as zero
3
Reserved
Reserved - Read as zero
4
DRVDEN1
0
DRVDEN 1 output as per DRVDEN table
1
DRVDEN 1 pin is tri-state (default)
5
MFM
IDENT is used in conjunction with MFM to define the interface mode of
operation.
6
IDENT
IDENT
1
1
0
0
MFM
1
0
1
0
MODE
AT Mode (Default)
Reserved
Reserved
Reserved
7
Reserved
Reserved - Read as zero
CR04
This register can
only be accessed in the Configuration Mode and the CSR has been initialized
to 04H. The default value after power up is 00H.
Table 38 - CR04
BIT NO.
BIT NAME
DESCRIPTION
0:7
Reserved
Reserved - Read as zero


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