R01UH0092EJ0110 Rev.1.10
Page 802 of 807
Jul 31, 2012
M16C/64C Group
32. Usage Notes
32.23.4 User Boot
32.23.4.1 User Boot Mode Program
Note the following when using user boot mode:
•
When using user boot mode, make sure to allocate the program to be executed to program ROM 2.
•
Bits VDSEL1 and LVDAS in the OFS1 address are disabled in boot mode.
•
When restarting the MCU in user boot mode after starting it in user boot mode, RAM becomes
undefined.
•
If addresses 13FF8h to 13FFBh are all 00h, the MCU does not enter standard serial I/O mode.
Therefore, the programmer or on-chip debugger cannot be connected.
•
As the reset sequence differs, the time necessary for starting the program is longer than in single-
chip mode.
•
Functions in user boot mode cannot be debugged by the on-chip debugging emulator or full spec
emulator.
•
While using user boot mode, do not change the input level of the pin used for user boot entry.
However, if there is a possibility that the input level may change, perform the necessary processes
in user boot mode, then restart the MCU in single-chip mode before the input level changes.
•
To use user boot mode after standard serial I/O mode, turn off the power when exiting standard
serial I/O mode, and then turn on the power again (cold start). The MCU enters user boot mode
under the right conditions.
Содержание M16C Series
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