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PC87322VF 데이터시트(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 PC87322VF
상세설명  Floppy Disk Controller with Dual UARTs, Enhanced Parallel Port, and IDE Interface
PDF  84 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87322VF 데이터시트(HTML) 13 Page - National Semiconductor (TI)

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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
register updates on the second consecutive write
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
13



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