Rev. 1.0, 09/02, page 57 of 568
,
D15 to D0
High
*
*
*
φ
Address bus
Vector fetch
Internal
processing
Fetch of first
program instruction
(1)
(2)
(4)
(6)
(3)
(5)
(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
Note:
*
Three program wait states are inserted.
Figure 4.2 Reset Sequence (Advanced Mode with On-chip ROM Disabled: Not Available in
this LSI)
4.3.2
Interrupts after Reset
If an interrupt is accepted immediately after a reset and 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 exception handling is
executed. Since the first instruction of a program is always executed immediately after the reset,
make sure that this instruction initializes the stack pointer (example: MOV.L #xx: 32, SP).
4.3.3
State of On-Chip Peripheral Modules after Reset Release
After reset release, MSTPCRA to MSTPCRC are initialized to H
′
3F, H
′
FF, and H
′
FF,
respectively, and all modules except the DTC enter module stop mode. Consequently, on-chip
peripheral module registers cannot be read or written to. Register reading and writing is enabled
when the module stop mode is cancelled.
Summary of Contents for H8S/2627
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