Microcontroller User's Manual

29-36 MCF5282 User’s Manual MOTOROLA
Background Debug Mode (BDM)
Command Sequence:
Figure 29-38. RDMREG Command Sequence
Operand Data: None
Result Data: The contents of the selected debug register are returned as a
longword value. The data is returned most-significant word first.
29.5.3.3.12 Write Debug Module Register (
WDMREG)
The operand (longword) data is written to the specified debug module register. All 32 bits
of the register are altered by the write. DSCLK must be inactive while the debug module
register writes from the CPU accesses are performed using the WDEBUG instruction.
Command Format:
Table 29-3 shows the definition of the DRc write encoding.
Command Sequence:
Figure 29-40. WDMREG Command Sequence
Table 29-20. Definition of DRc Encoding—Read
DRc[4:0] Debug Register Definition Mnemonic Initial State Page
0x00 Configuration/Status CSR 0x0 p. 29-10
0x01–0x1F Reserved — — —
15 12 11 8 7 5 4 0
0x2 0xC 100 DRc
D[31:16]
D[15:0]
Figure 29-39. WDMREG BDM Command Format
RDMREG
???
XXX
MS RESULT
NEXT CMD
LS RESULT
XXX
’ILLEGAL’
NEXT CMD
’NOT READY’
WDMREG
???
MS DATA
’NOT READY’
LS DATA
’NOT READY’
XXX
’ILLEGAL’
NEXT CMD
’NOT READY’
NEXT CMD
’CMD COMPLETE’