FDC37C78-HT 查看數據表（PDF） - Microchip Technology

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FDC37C78-HT

Floppy Disk Controller

Microchip Technology 

DIGITAL INPUT REGISTER (DIR)

Address 3F7 READ ONLY

This register is read-only.

7

6

5

4

3

2

1

0

DSK

CHG

RESET N/A N/A N/A N/A N/A N/A N/A N/A

COND.

BIT 0 - 6 UNDEFINED

The data bus outputs D0 - 6 will remain in a high

impedance state during a read of this register.

BIT 7 DSKCHG

This bit monitors the pin of the same name and

reflects the opposite value seen on the disk cable.

20

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