Fujitsu FR81S User Manual
CHAPTER 3: CPU
3. CPU Operating Description
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : CPU
FUJITSU SEMICONDUCTOR CONFIDENTIAL
7
3.1. CPU Operating Status
The CPU operating status is shown below.
The CPU operation state includes the following states: reset state, normal run state, low-power consumption
state, and debug run state.
The operating state transitions are shown below.
Figure 3-1 CPU operating state transition diagram
Reset state
DSU directive
Low-power
consumption
state
Debug state
Privilege mode
User mode
Privilege mode
User mode
User State
RETI
EIT
RETI
Low-power consumption mode
transition sequence execution
RETI
EIT
EIT
EIT
Low-power consumption mode
transition sequence execution
Reset
Break
DSU directive
DSU directive
ICE not connected
Debug Run State
Normal Run State
MB91520 Series
MN705-00010-1v0-E
104