MC68HC708XL36 FREESCALE [Freescale Semiconductor, Inc], MC68HC708XL36 Datasheet - Page 170

• Manufacturer Part Number: MC68HC708XL36
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

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MC68HC708XL36
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NOTE:
If the received bytes match those at locations $FFF6–$FFFD, the host
bypasses the security feature and can read all EPROM locations and
execute code from EPROM. Security remains bypassed until a power-on
reset occurs. After the host bypasses security, any reset other than a
power-on reset requires the host to send another eight bytes. If the reset
was not a power-on reset, security remains bypassed regardless of the
data that the host sends.
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 EPROM locations returns undefined data, and trying
to execute code from EPROM 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.
The MCU does not transmit a break character until after the host sends
the eight security bytes.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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