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branching to the programming control program. These registers must be initialized at the
beginning of the programming control program, since the stack pointer (SP), in particular, is
used implicitly in subroutine calls, etc.
7. Boot mode can be cleared by a reset. Cancel the reset *
at least 20 states, and then setting the mode pins. Boot mode is also cleared when a WDT
overflow occurs.
8. Do not change the mode pin input levels in boot mode. If mode pin input levels are changed
from low to high during reset, operating modes are switched and the state of ports that are also
used for address output and bus control output signals (AS, RD, and HWR) are changed. *
Therefore, set these pins carefully not to be output signals during reset or not to conflict with
LSI external signals.
9. All interrupts are disabled during programming or erasing of the flash memory.
Notes: 1. After reset is cancelled, mode pin input settings must satisfy the mode programming
setup time (t
2. The ports that also have address output functions output low as address output when
the MD1 pin is set to 0 during a reset. In other cases, it enters the high impedance state.
Bus control output signals output high when the MD1 pin is set to 0 during a reset. In
other cases, it enters the high impedance state.
= 4 states).
MDS
1
after driving the reset pin low, waiting
Rev. 3.00 Jan 25, 2006 page 729 of 872
Section 24 ROM
2
REJ09B0286-0300
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