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3
3.6.5
PMU Config
ITEM
Automatic
High speed
Low speed
High->low
Low->sleep
Automatic
If the Automatic parameter is OFF, all other Power Management parameters have no
meaning.
When the Automatic parameter is ON, the Power Management proceeds as follows:
−
after the high-low timeout selected time the CPU automatically reduces its clock
frequency and passes from High speed to Low speed (both frequencies can be
set through setup);
−
once the CPU is in Low speed and no activity occurs after the programmed
timeout it enters the SUSPEND state. The CPU resumes operations when a
WAKEUP event occurs, or when the SCAN key is pressed;
−
when the CPU is in SUSPEND and no WAKEUP event occurs after the programmed
time, it enters the OFF state through which all peripherals are disabled. The CPU
resumes operation only when pressing the SCAN key.
18
VALUES
On (*)
Off
8 MHz
16 MHz (*)
32 MHz
8 MHz
4 MHz
2 MHz
1 MHz (*)
1/8 s
1/4 s
1/2 s (*)
1 s
4 s
8 s
16 s
8 s
16 s (*)
32 s
1 m
4 m
8 m
16 m
DESCRIPTION
Enables automatic power
management
Clock frequency in ON state.
See description of Power Management
for further information
Clock frequency in IDLE state
Selects the period without Primary
activity (see Activities) before passing
from High speed to the IDLE state
(Low speed)
Selects the period without any activity
before passing from the IDLE state
(Low speed) to SUSPEND (Off).
FORMULA COLOR™
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