HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 91
HD6435348R
Manufacturer Part Number
HD6435348R
Description
Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
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3.8.2 Program Execution State
In this state the CPU executes program instructions in normal sequence.
3.8.3 Exception-Handling State
The exception-handling state is a transient state that occurs when the CPU alters the normal
program flow due to an interrupt, trap instruction, address error, or other exception. In this state
the CPU carries out a hardware-controlled sequence that prepares it to execute a user-coded
exception-handling routine.
*
*
1
2
Exception-handling
Bus-released state
From any state except the hardware standby mode, a transition to the reset state occurs
whenever RES goes Low.
A transition to the hardware standby mode from any state occurs when STBY goes Low.
Reset state
state
BREQ = 1
*
1
handling
exception
BREQ = 0
handling
for exception
End of
Figure 3-12 State Transitions
STBY = 1, RES = 0
Program execution state
Interrupt request
Request
BREQ = 1
BREQ = 0
NMI
instruction
with standby
71
SLEEP
flag set
SLEEP
instruction
Hardware standby mode
Sleep mode
Software standby mode
* 2
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