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Power
Up
See function block D of the A6A2 regulator schematic diagram in the component-level
information.
The power up circuitry generates the PWR UP signal, which tells the microprocessor that
the supplies are up and stable. PWR UP will go high when the
+5
Vdc supply exceeds
t4.99
Vdc. PWR UP will go low when this voltage drops below i-4.895 Vdc. Once PWR UP
is set low, it will stay low for at least 50 ms before going high, even if the
+5
Vdc supply
exceeds
t4.99
Vdc before 50 ms have elapsed.
13-18 Display/Power Supply Section