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XBOOT
4.6.19 Transfer Data Bootstrap Mode
XBOOT [<address1> [<address2>]]
where:
<address1>
<address2>
The XBOOT command loads/transfers a block of data from address1 through address2 via the
serial communications interface (SCI) to another MC68HC11 MCU device which has been reset
in the bootstrap mode. A leading control character of $FF is sent prior to sending the data block.
This control character is part of the bootstrap mode protocol and establishes the baud rate for the
rest of the transfer.
If only one address is provided, the address will be used as the starting address and the block size
will default to 256 bytes. If no addresses are provided, the block of addresses from $C000
through $C0FF is assumed by the BUFFALO monitor program.
The MC68HC11A8 MCU requires a fixed block size of 256 bytes
for bootloading while the MC68HC11E9 MCU can accept a
variable length block of 1 to 512 bytes.
The XBOOT command generates SCI transmitter output signals at 7812.5 baud which are
intended for another MC68HC11 MCU device operating in the bootstrap mode. These signals
appear as nonsense data to the terminal display used for normal communication with the EVBU.
After using the XBOOT command the EVBU must be reset by pressing the reset switch S1
before normal communications can resume.
M68HC11EVBU/D
Transfer Data Bootstrap Mode
Starting address.
Ending address.
NOTE
OPERATING INSTRUCTIONS
4-33
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