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ML610Q421/ML610Q422/ML610421 User’s Manual
Chapter 4 MCU Control Function
4 – 1
4. MCU Control Function
4.1 Overview
The operating states of this LSI are classified into the following 4 modes including system reset mode:
System reset mode
Program run mode
HALT mode
STOP mode
For system reset mode, see Chapter 3, “Reset Function”.
This LSI 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.
4.1.1 Features
•
HALT mode, where the CPU stops operating and only the peripheral circuit is operating
•
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 peripherals (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 of reset
Program
run mode
HALT mode STOP mode
Reset
Reset
STP = “1”
External interrupt
HLT = “1”
Interrupt
Power on