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Chapter 2
CPU Basics
Power Supply Detection Reset
Reset is generated when the power is on for the internal chip. The power supply voltage reaches to the power sup-
ply detection level, the oscillation stabilization wait starts. After the oscillation stabilization wait is completed, the
internal reset is released and changes to the normal operation status mode (NORMAL mode). Also, when the
power supply voltage drops to the power supply detection level, the reset is generated for the internal chip. When
the power supply voltage changes more rapidly than the power supply voltage change rate defined in the electric
characteristics, the reset may not be generated.
Internal RAM is undefined when the power supply is on. Initialize it before using.
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II - 22
Operation Mode
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