Section 4
Exception Handling
Rev.2.00 Jun. 28, 2007 Page 73 of 666
REJ09B0311-0200
4.3.2
Interrupts after Reset
If an interrupt is accepted after a reset but before the stack pointer (SP) is initialized, the 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. Since the first instruction of a program is
always executed immediately after the reset state ends, make sure that this instruction initializes
the stack pointer (example: MOV.L #xx: 32, SP).
4.3.3
On-Chip Peripheral Functions after Reset Release
After the reset state is released, MSTPCRA and MSTPCRB are initialized to H'0FFF and H'FFFF,
respectively, and all modules except the DTC enter module stop state.
Consequently, on-chip peripheral module registers cannot be read or written to. Register reading
and writing is enabled when module stop state is canceled.
RES
High
Vector
fetch
Internal
operation
First
instruction
prefetch
(1) Reset exception handling vector address (when reset, (1) = H'000000)
(2) Start address (contents of reset exception handling vector address)
(3) Start address ((3) = (2))
(4) First instruction in the exception handling routine
I
φ
Internal
address bus
Internal read
signal
Internal write
signal
Internal data
bus
(1)
(2)
(4)
(3)
Figure 4.1 Reset Sequence (On-chip ROM Enabled Advanced Mode)
Содержание H8SX/1650
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Страница 546: ...Section 13 Serial Communication Interface SCI Rev 2 00 Jun 28 2007 Page 524 of 666 REJ09B0311 0200...
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Страница 574: ...Section 16 RAM Rev 2 00 Jun 28 2007 Page 552 of 666 REJ09B0311 0200...
Страница 584: ...Section 17 Clock Pulse Generator Rev 2 00 Jun 28 2007 Page 562 of 666 REJ09B0311 0200...
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Страница 668: ...Section 20 Electrical Characteristics Rev 2 00 Jun 28 2007 Page 646 of 666 REJ09B0311 0200...
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