FDC37C78-HT View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

FDC37C78-HT

Floppy Disk Controller

Microchip Technology 

Table 30 - PC/AT Available Registers

Available Registers

Base + Address

PC-AT

Access Permitted

Access to these registers DOES NOT wake up the part

00H

----

R

01H

----

R

02H

DOR (1)

R/W

03H

---

---

04H

DSR (1)

W

06H

---

---

07H

DIR

R

07H

CCR

W

Access to these registers wakes up the part

04H

MSR

R

05H

Data

R/W

Note 1: Writing to the DOR or DSR does not wake up the part, however, writing any of the motor enable

bits or doing a software reset (via DOR or DSR reset bits) will wake up the part

Table 31 - State of System Pins in Auto Powerdown

System Pins

State in Auto Powerdown

Input Pins

IOR

Unchanged

IOW

Unchanged

A[0:9]

Unchanged

D[0:7]

Unchanged

RESET

Unchanged

IDENT

Unchanged

DACK

Unchanged

TC

Unchanged

Output Pins

IRQ

Unchanged (low)

DB[0:7]

Unchanged

FDRQ

Unchanged (low)

60

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