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Chapter 8
Clock Generator
Preliminary User’s Manual U14913EE1V0UM00
8.5.2 Power Save Modes Outline
V850E/CA1 / ATOMIC is provided with the following standby modes: HALT, IDLE, WATCH, and software
STOP.
Application systems, which are designed so that these modes are switched appropriately according to
operation purposes, reduce power consumption efficiently.
(1)
HALT mode:
In this mode supply of the operating clock to the CPU is stopped whereby other on-chip peripheral
functions continue to operate. Combining this mode with the normal operating mode to provide
intermittent operations enables the overall system power consumption to be reduced.
This mode is entered by executing the dedicated instruction (HALT).
(2)
IDLE mode:
In this mode, the clock generator continues to operate but stopping the supply of internal system
clock stops the overall system. As it is not necessary to secure the oscillation stabilization time, it is
possible to switch to the normal operating mode quickly in response to a release signal.
This mode provides low power consumption, where the power is only consumed from the OSC,
Watch/Watchdog, LCD and the flash memory.
This mode is entered by setting registers with software.
(3)
WATCH mode:
In this mode, the clock generator stop to supply the clock excluding Watch/Watchdog timer unit. The
entire system stops. This mode provides ultra-low power consumption, where the power consumed
is only from OSC, Watch/ Watchdog and LCD circuit. (In addition clock supply to LCD may be
stopped by software.)
This mode is entered by setting registers with software.
(4)
Software STOP mode:
In this mode, the clock generator is stopped and the entire system stops. This mode provides ultra-
low power consumption, where the power consumed is only leakage current.
This mode is entered by setting registers with software.
Remark:
In the HALT mode, both the oscillator and the PLL continue to operate depend on PLLEN
bit.
By using PLL mode control, PLL is turn off to achieve low power.
However, when the external clock drives this product, the oscillator is stopped. In contrast,
the PLL synthesizer stops in the direct mode.
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