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H8/3006 Datasheet(PDF) 102 Page - Renesas Technology Corp

Part # H8/3006
Description  16-Bit Single-Chip Microcomputer
PDF  796 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3006 Datasheet(HTML) 102 Page - Renesas Technology Corp

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4. Exception Handling
Rev.5.00 Sep. 12, 2007 Page 74 of 764
REJ09B0396-0500
φ
Address bus
RES
RD
HWR
D
to D
15
0
Vector fetch
Internal
processing
Prefetch of first
program instruction
(1), (3)
(2), (4)
(5)
(6)
Note: After a reset, the wait-state controller inserts three wait states in every bus cycle.
High
LWR
,
Address of reset vector: (1) = H'000000, (3) = H'000002
Start address (contents of reset exception handling vector address)
Start address
First instruction of program
(2)
(4)
(3)
(1)
(5)
(6)
Figure 4.3 Reset Sequence (Modes 2 and 4)
4.2.3
Interrupts after Reset
If an interrupt is accepted after a reset but before the stack pointer (SP) is initialized, PC and CCR
will not be saved correctly, leading to a program crash. To prevent this, all interrupt requests,
including NMI, are disabled immediately after a reset. The first instruction of the program is
always executed immediately after the reset state ends. This instruction should initialize the stack
pointer (example: MOV.L #xx:32, SP).



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