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PC87322VF Datasheet(PDF) 13 Page - National Semiconductor (TI) |
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PC87322VF Datasheet(HTML) 13 Page - National Semiconductor (TI) |
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13 / 84 page  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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