HD64F3039F18 Datasheet, PDF (73/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

2.8 Processing States
Section 2 CPU
2.8.1 Overview
The H8/300H CPU has four processing states: the program execution state, exception-handling
state, power-down state, and reset state. The power-down state includes sleep mode, software
standby mode, and hardware standby mode. Figure 2.11 classifies the processing states. Figure
2.13 indicates the state transitions.
Processing states
Program execution state
The CPU executes program instructions in sequence
Exception-handling state
A transient state in which the CPU executes a hardware sequence
(saving PC and CCR, fetching a vector, etc.) in response to a reset,
interrupt, or other exception
Reset state
The CPU and all on-chip supporting modules are initialized and halted
Power-down state
The CPU is halted to conserve power
Sleep mode
Software standby mode
Hardware standby mode
Figure 2.11 Processing States
2.8.2 Program Execution State
In this state the CPU executes program instructions in normal sequence.
Rev.3.00 Mar. 26, 2007 Page 49 of 682
REJ09B0353-0300