MC68340FE16E Datasheet, PDF (222/441 Pages) Freescale Semiconductor, Inc – Integrated Processor with DMA User’s Manual

Freescale Semiconductor, Inc.
Command Sequence:
CALL
???
MS ADDR
"NOT READY"
XXX
"ILLEGAL"
LS ADDR
"NOT READY"
NEXT CMD
"NOT READY"
STACK
RETURN PC
FREEZE
NEGATED
PREFETCH
STARTED
NORMAL
MODE
XXX
BERR/AERR
NEXT CMD
"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
MOVE.B
SRA,D0
CHKSTAT
TBA,OUTPUT
Move serial status to D0
Loop until condition true
Transmit character
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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