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M16C/5L Group, M16C/56 Group
26.11.4 User Boot
26.11.4.1 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.
• The LVDAS bit in the OFS1 address and bits WDTRCS1 and WDTRCS0 in the OFS2 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.
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
26. Flash Memory
Page 701 of 803
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