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Section 24 Flash Memory
24.8.3
User Boot Mode
This LSI has user boot mode that is initiated with different mode pin settings than those in boot
mode or user program mode. User boot mode is a user-arbitrary boot mode, unlike boot mode that
uses the on-chip SCI.
Only the user MAT can be programmed/erased in user boot mode. Programming/erasing of the
user boot MAT is only enabled in boot mode or programmer mode.
(1)
User Boot Mode Initiation
For the mode pin settings to start up user boot mode, see table 24.7.
When the reset start is executed in user boot mode, the built-in check routine runs. The user MAT
and user boot MAT states are checked by this check routine.
While the check routine is running, NMI and all other interrupts cannot be accepted.
Next, processing starts from the execution start address of the reset vector in the user boot MAT.
At this point, H'AA is set to FMATS because the execution target MAT is the user boot MAT.
Rev. 1.00 May 09, 2008 Page 756 of 954
REJ09B0462-0100
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