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 follo wing chara cters can be us ed in a stri ng 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, b ut only t hose ha ving a n ASCII code
value greater than or equal to 0x30 are kept fo r b-re cord asse mbling. Sen ding a chara cter t hat 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.