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High
Vector fetch
Internal
processing
Prefetch of first
program instruction
(1)(3) Reset exception-handling vector address (when reset, (1)=H'000000, (3)=H'000002)
(2)(4) Start address (contents of reset exception-handling vector address)
(5) Start address ((5)=(2)(4))
(6) First program instruction
φ
Internal
address bus
Internal read
signal
Internal write
signal
Internal data
bus
(1)
(2)
(4)
(6)
(3)
(5)
Figure 4.1 Reset Sequence
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 reset release, the module stop control register (MSTPCR, EXMSTPCR) is initialized and all
modules enter module stop mode.
Consequently, on-chip peripheral module registers cannot be read or written to. Register reading
and writing is enabled when module stop mode is exited.
Содержание H8S/2437
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