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M16C/64C Group
30.11.4 User Boot
30.11.4.1 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.
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
30. Flash Memory
Page 709 of 807
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