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FDC37C78-HT Datasheet(PDF) 70 Page - Microchip Technology

Part # FDC37C78-HT
Description  Floppy Disk Controller
Download  82 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

FDC37C78-HT Datasheet(HTML) 70 Page - Microchip Technology

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70
CR1F
This register can only be accessed in the Configuration Mode and after the CSR has been initialized
to 1FH. The default value of this register after power up is 00H. This register indicates the Drive Type
used for each drive. Refer to CR0B for Data Rate Table register.
FDD3
FDD2
FDD1
FDD0
D7
D6
D5
D4
D3
D2
D1
D0
DT0
DT1
DT0
DT1
DT0
DT1
DT0
DT1
DTx = Drive Type select
DT0
DT1
DRVDEN0
(Note)
DRVDEN1
(Note)
Drive Type
0
0
DENSEL
DRATE0
4/2/1 MB 3.5"
2/1 MB 5.25" FDDS
2/1.6/1 MB 3.5" (3-MODE)
0
1
DRATE1
DRATE0
1
0
nDENSEL
DRATE0
1
1
DRATE0
DRATE1
Note:
DENSEL, DRATE1 and DRATE0 map onto two output pins DRVDEN0 and DRVDEN1.


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