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programming control program and the host. The contents of CPU general registers are
undefined after a branch to the programming control program. Note, in particular, that since
the stack pointer is used implicitly in subroutine calls and the like, it should be initialized at the
start of the programming control program.
6. Boot mode is exited by means of a reset. Drive the reset pin low, wait for the elapse of at least
20 states, then set the FWE pin and mode pins to release the reset. Boot mode is also exited in
the event of a WDT overflow reset.
7. Do not change the input level of the mode pins while in boot mode. If the input level of a mode
pin is changed (from low to high) during a reset, the states of ports with a dual function as
address outputs, and bus control output signals (_AS, _RD, _WR), will change due to switching
of the operating mode. Either make pin settings so that these pins do not become output signal
pins during a reset, or take precautions to prevent collisions with external signals.
8. Interrupts cannot be used during flash memory programming or erasing.
Note: * FWE pin and mode pin input must satisfy the mode programming setup time (t
ns) when a reset is released.
MDS
Rev. 3.0, 10/02, page 577 of 686
= 200
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