hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 78
hd66100
Manufacturer Part Number
hd66100
Description
H8/3867 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66100.pdf
(495 pages)
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3.1
Exception handling is performed in the H8/3864 Series when a reset or interrupt occurs. Table 3.1
shows the priorities of these two types of exception handling.
Table 3.1
Priority
High
Low
3.2
3.2.1
A reset is the highest-priority exception. The internal state of the CPU and the registers of the on-
chip peripheral modules are initialized.
3.2.2
As soon as the RES pin goes low, all processing is stopped and the chip enters the reset state.
To make sure the chip is reset properly, observe the following precautions.
Reset exception handling takes place as follows.
At power on: Hold the RES pin low until the clock pulse generator output stabilizes.
Resetting during operation: Hold the RES pin low for at least 10 system clock cycles.
The CPU internal state and the registers of on-chip peripheral modules are initialized, with the
I bit of the condition code register (CCR) set to 1.
The PC is loaded from the reset exception handling vector address (H'0000 to H'0001), after
which the program starts executing from the address indicated in PC.
Overview
Reset
Overview
Reset Sequence
Exception Source
Reset
Interrupt
Exception Handling Types and Priorities
Section 3 Exception Handling
Time of Start of Exception Handling
Exception handling starts as soon as the reset state is cleared
When an interrupt is requested, exception handling starts after
execution of the present instruction or the exception handling in
progress is completed
63
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