PC87322VF datasheet(13/84 Pages) NSC

Numer części	PC87322VF

Szczegółowy opis	Floppy Disk Controller with Dual UARTs, Enhanced Parallel Port, and IDE Interface

PDF	84 Pages

Scroll/Zoom	100%

Producent	NSC [National Semiconductor (TI)]

Strona internetowa	http://www.national.com

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20 Configuration Registers (Continued)

D Modify the configuration data

E Write the changed data for the Configuration Register

in two consecutive writes to the Data Register The

F Enable CPU interrupts

A single read access to the Index and Data Registers can

be done at any time without disabling CPU interrupts When

the Index Register is read the last value loaded into the

Index Register will be returned When the Data Register is

read the Configuration Register data pointed to by the In-

dex Register will be returned

TLC11870 – 4

TLC11870 – 6

TLC11870 – 5

TLC11870 – 7

TLC11870 – 8

FIGURE 2-1 PC87322VF Configuration Registers

23 HARDWARE CONFIGURATION

During reset 1 of 32 possible sets of default values are

loaded into the first three Configuration Registers A strap-

ping option on five pins (CFG0 – 4) selects the set of values

that is loaded This allows for automatic configuration with-

out software intervention Table 2-1 shows the 32 possible

default configurations The default configuration can be

modified by software at any time after reset by using the

access procedure described in the Software Configuration

Section

PC87322VF Arkusz danych(PDF) 13 Page - National Semiconductor (TI)