MC68HC08AZ60 Datasheet, PDF (152/452 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Monitor ROM (MON)
If the received bytes do not match the data at locations $FFF6–$FFFD,
the host fails to bypass the security feature. The MCU remains in monitor
mode, but reading ROM locations returns undefined data, and trying to
execute code from ROM causes an illegal address reset. After the host
fails to bypass security, any reset other than a power-on reset causes an
endless loop of illegal address resets.
After receiving the eight security bytes from the host, the MCU transmits
a break character signalling that it is ready to receive a command.
NOTE: The MCU does not transmit a break character until after the host sends
the eight security bytes.
MC68HC08AZ60 — Rev 1.0
152
Monitor ROM (MON)
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12-mon
MOTOROLA