
ÉlanSC310 Microcontroller Evaluation Board User’s Manual
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The following main menu appears:
ELAN PMU Evaluation Utility
Version 1.0
A: Setup PMU Mode Characteristics (PMCx Pins, CPU Speed)
B: Force PMU State Transitions
C: Test Battery Level & ACIN Pins
X: Restore PMU State and Exit to DOS
Z: Leave current PMU values and Exit to DOS
Enter Selection =>/
The spinning cursor "/" is used to emulate typical CPU activity. This activity gives
a lower current reading for core ÉlanSC310 microcontroller current than if the
processor was sitting idle waiting for keyboard input. This is because cycles to the
ISA devices (which occur as a result of this activity) are run at 9.2 Mhz. CPU idle
cycles occur at the High Speed PLL mode frequency (33/25/20/9.2 Mhz).
A: Setup PMU Mode Characteristics (PMCx Pins, CPU
Speed)
This menu selection brings up a matrix of options that can be set for each PMU
mode. The value of the highlighted matrix item can be changed by pressing the
"+" or "–" keys on the keyboard. The arrow keys control which item is highlighted.
Matrix items with a "*" after them are fixed in the ÉlanSC310 microcontroller and
cannot be highlighted or changed. Matrix items with a "#" after them are fixed at
the current state due to a requirement of the evaluation board. These items cannot
be highlighted or changed.
Changes made to this screen do not take effect until either the "S" key is pressed
(Program Elan), or the "X" key is pressed (Program Elan & Return to Main Menu).
To exit this screen without programming the ÉlanSC310 microcontroller with any
changes, press the "Q" key. To restore the values to those currently programmed
in the ÉlanSC310 microcontroller, press the "L" key.
While in this screen, the CPU is running in High Speed PLL mode. When any
changes to the High Speed PLL mode column are saved, the results are immediately
noticeable (e.g., the effect CPU Speed has on core current). Changes to other
columns on the screen are not noticeable until those PMU modes are entered.
evalbd.book : ch3 Page 5 Thursday, August 8, 1996 2:34 PM