Freescale Semiconductor, Inc.
Command Sequence:
CALL
???
MS ADDR
"NOT READY"
LS ADDR
"NOT READY"
STACK
RETURN PC
XXX
NEXT CMD
"NOT READY"
"ILLEGAL"
FREEZE
NEGATED
NORMAL
MODE
PREFETCH
STARTED
XXX
NEXT CMD
BERR/AERR
"NOT READY"
Operand Data:
The 32-bit operand data is the starting location of the patch routine, which is the initial
PC upon exiting BDM.
Result Data:
None
As an example, consider the following code segment. It outputs a character from the
MC68340 serial module channel A.
CHKSTAT:
MOVE.B
BNE.B
SRA,D0
Move serial status to D0
Loop until condition true
Transmit character
CHKSTAT
TBA,OUTPUT
MOVE.B
MISSING:
ANDI.B
RTS
#3,D0
Check for TxEMP flag
BDM and the CALL command can be used to patch the code as follows:
1. Breakpoint user program at CHKSTAT
2. Enter BDM
3. Execute CALL command to MISSING
4. Exit BDM
5. Execute MISSING code
6. Return to user program
5.6.2.8.14 Reset Peripherals (RST). RST asserts RESET for 512 clock cycles. The CPU
is not reset by this command. This command is synonymous with the CPU RESET
instruction.
MOTOROLA
MC68340 USER’S MANUAL
5- 85
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