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Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
9.4.2 Power Save Modes Outline
V850E/CA2 Jupiter 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
(Main-oscillator, Sub-Oscillator) and Watch timer / Watchdog timer. This mode is entered by set-
ting registers with software.
(3)
WATCH mode:
In this mode, the clock generator (PLL and SSCG) stops operation. Therefore, the entire system
excluding Watch timer / Watchdog timer unit stops. This mode provides low power consumption,
where the power consumed is only from OSC (Main-oscillator, Sub-Oscillator) and Watch timer /
Watchdog timer circuit. This mode is entered by setting registers with software.
(4)
SUB-WATCH mode:
In this mode, the clock generator (PLL and SSCG) stops operation. Therefore, the entire system
excluding Watch timer / Watchdog timer unit stops. This mode provides ultra-low power consump-
tion, where the power consumed is only from the Sub-Oscillator and Watch timer / Watchdog timer
circuit. This mode is entered by setting registers with software.
(5)
Software STOP mode:
In this mode, the main clock generator is stopped and the entire system stops. This mode provides
ultra-low power consumption, where the power consumed is only leakage current and Sub-Oscilla-
tor operation if a crystal is connected. This mode is entered by setting registers with software.
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