MC81F4x16
27.4 Changing the stabilizing time
After reset or wake up from the stop/sleep mode, there is a stabilizing time to make sure the system
oscillation is stabilized. Actually the stabilizing time is the basic interval timer‟s one cycle time.
So it is adjustable by changing the basic interval timer‟s clock division.( See chapter „15.BASIC
INTERVAL TIMER‟ at page 110 to know how to change the basic interval timer‟s clock division.)
It is useful to reduce the power consumption in battery operation with stop/sleep mode. In the battery
operation, reducing normal operation time is the key-point to reducing the power consumption.
Note that, it is not possible after reset. Because after reset, the control registers are initialized.
27.5 Minimizing Current Consumption
The Stop mode is designed to reduce power consumption. To minimize current drawn during Stop
mode, the user should turnoff output drivers that are sourcing or sinking current, if it is practical.
When port is configured as an input, input level
should be closed to 0V or 5V to avoid power
consumption.
Figure 27-6 Application Example of Unused Input Port
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October 19, 2009 Ver.1.35
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