MC68VZ328 Integrated Processor User's Manual

17-8 MC68VZ328 User’s Manual 
Special Notes
17.3 Special Notes
The following information may be useful when the MC68VZ328 is in bootstrap mode.
• A b-record is a string of uppercase hex characters with optional comments that follow.
• Comments in a b-record or b-record file must not contain any word or symbol that is longer than
nine characters. However, the following characters can be used in a string of any length (all of these
have an ASCII code value that is less than 0x30):
—space
— ! (exclamation point)
— “ (quotation mark)
— # (number sign)
— $ (dollar sign)
— % (percentage symbol)
— & (ampersand)
— ( (opening parenthesis)
— ) (closing parenthesis)
— * (asterisk)
— + (plus sign)
— - (minus sign)
— . (period)
— / (forward slash)
• The bootloader program echoes all characters being received, but only those having an ASCII code
value greater than or equal to 0x30 are kept for b-record assembling. Sending a character that is not
a b-record (ASCII code value < 0x30) will force the bootloader to start a new b-record.
• The D[6:0] and A0 registers are used by the bootloader program. Writing to these registers may
corrupt the bootloader program.
• Visit the DragonBall Web site at http://www.Motorola.com/DragonBall for bootstrap utility
programs.