C8051F52X Datasheet, PDF (24/220 Pages) Silicon Laboratories – 8/4/2 kB ISP Flash MCU Family

C8051F52x-53x
1.3. Operating Modes
The C8051F52x/F53x devices have four operating modes: Active (Normal), Idle, Suspend, and Stop.
Active mode occurs during normal operation when the oscillator and peripherals are active. Idle mode halts
the CPU while leaving the peripherals and internal clocks active. In Suspend and Stop mode, the CPU is
halted, all interrupts and timers are inactive, and the internal oscillator is stopped. The various operating
modes are described in Table 1.2 below:
Table 1.2. Operating Modes Summary
•
Active
•
•
•
•
Idle
•
•
•
Suspend
•
•
Stop _•
Properties
SYSCLK active
CPU active (accessing Flash)
Peripherals active or inactive
depending on user settings
SYSCLK active
CPU inactive (not accessing
Flash)
Peripherals active or inactive
depending on user settings
Internal oscillator inactive
If SYSCLK is derived from the
internal oscillator, the peripher-
als and the CIP-51 will be
stopped
SYSCLK inactive
CPU inactive (not accessing
Flash)
Digital peripherals inactive; ana-
log peripherals active or inactive
depending on user settings
Power
Consumption
Full
Less than Full
Low
Very low
How
Entered?
—
How Exited?
—
IDLE Any enabled interrupt
(PCON.0)
or device reset
SUSPEND Port 0 event match
(OSCICN.5) _{Port 1 event match}
Comparator 0 enabled
and output is logic ‘0’
STOP
(PCON.1)
Device Reset
See Section “9.3. Power Management Modes” on page 83 for Idle and Stop mode details. See Section
“15.1.1. Internal Oscillator Suspend Mode” on page 134 for more information on Suspend mode.
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