Microcontroller User's Manual

29-30 MCF5282 User’s Manual MOTOROLA
Background Debug Mode (BDM)
The size field is examined each time a FILL command is processed, allowing the operand
size to be altered dynamically.
Command Formats:
Command Sequence:
Figure 29-28. FILL Command Sequence
Operand Data: A single operand is data to be written to the memory location. Byte
data is sent as a 16-bit word, justified in the least-significant byte; 16-
and 32-bit operands are sent as 16 and 32 bits, respectively.
Result Data: Command complete status (0xFFFF) is returned when the register
write is complete. A value of 0x0001 (with S set) is returned if a bus
error occurs.
15 12 11 8 7 4 3 0
Byte 0x1 0xC 0x0 0x0
XXXXXXXX D[7:0]
Word 0x1 0xC 0x4 0x0
D[15:0]
Longword 0x1 0xC 0x8 0x0
D[31:16]
D[15:0]
Figure 29-27. FILL Command Format
XXX
’NOT READY’
FILL (B/W)
???
DATA
’NOT READY’
NEXT CMD
’NOT READY’
WRITE
MEMORY
LOCATION
XXX
BERR
NEXT CMD
’CMD COMPLETE’
XXX
’ILLEGAL’
NEXT CMD
’NOT READY’
XXX
’NOT READY’
FILL (LONG)
???
MS DATA
’NOT READY’
LS DATA
’NOT READY’
WRITE
MEMORY
LOCATION
XXX
BERR
NEXT CMD
’CMD COMPLETE’
XXX
’ILLEGAL’
NEXT CMD
’NOT READY’
NEXT CMD
’NOT READY’