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Mio336i PDA Maintenance
Mio336i PDA Maintenance
1.3.5 Power Management
The power management block in the S3C2410X01 can activate five modes:
NORMAL mode, SLOW mode, IDLE mode, and Power-OFF mode.
NORMAL
mode: the block supplies clocks to CPU as well as all peripherals in the S3C2410X01. In this mode, the
power consumption will be maximized when all peripherals are turned on. It allows the user to control the
operation of peripherals by software. For example, if a timer is not needed, the user can disconnect the clock to the
timer to reduce power consumption.
SLOW
mode: Non-PLL mode. Unlike the Normal mode, the Slow mode uses an external clock (XTIpll or
EXTCLK) directly as FCLK in the S3C2410X01 without PLL. In this mode, the power consumption depends on
the frequency of the external clock only. The power consumption due to PLL is excluded.
IDLE
mode: the block disconnects clocks (FCLK) only to the CPU core while it supplies clocks to all other
peripherals. The IDLE mode results in reduced power consumption due to CPU core. Any interrupt request to CPU
can be woken up from the Idle mode.
Power-OFF
mode: the block disconnects the internal power. So, there occurs no power consumption due to CPU
and the internal logic except the wake-up logic in this mode. Activating the Power-OFF mode requires two
independent power sources. One of the two power sources supplies the power for the wake-up logic. The other one
supplies other internal logics including CPU, and should be controlled for power on/off. In the Power-OFF mode,
the second power supply source for the CPU and internal logics will be turned off. The wakeup from Power-OFF
mode can be issued by the EINT[15:0] or by RTC alarm interrupt.
Squid PDA supports two kinds of operating mode => Normal mode and Power-off mode.
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