Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User's Manual
Chapter 4 Power Management
FEUL620Q504 4-1
4 Power Management
4.1 General Description
The LSI has four power management modes listed below to save the Power consumption.
It also has a block control function, which power downs the circuits of unused peripherals (reset registers and stop
clock supplies) to make even more reducing the current consumption.
(1) HALT mode
(2) HALT-H mode
(3) DEEP-HALT mode
(4) STOP mode
4.1.1 Features
•
HALT mode, where the CPU stops operating and only the peripheral circuit is operating
•
HALT-H mode, where the high-speed clock is automatically stopped when the CPU stops operating.
•
DEEP-HALT mode, where the CPU stops operating and only LTBC and timer can operate at lower power
consumption
•
STOP mode, where both low-speed oscillation and high-speed oscillation stop
•
Stop code acceptor function, which controls transition to STOP mode
•
Block control function, which power downs the circuits of unused function blocks (reset registers and stop
clock supplies)
4.1.2 Configuration
Figure 4-1 shows an operating state transition diagram.
Figure 4-1 Operating State Transition Diagram
System reset
mode
Reset or BRK
instruction
Release reset
Program run
mode
STOP mode
Reset
Reset
STP=”1”
External
Interrupt
HLT=”1”
DHLT=”1”
HLTH=”1”
Power on
HALT mode
DEEP-HALT mode
HALT-H mode
Interrupt