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MCF5282CVM66 Datasheet, PDF (647/766 Pages) Freescale Semiconductor, Inc – MCF5282 and MCF5216 ColdFire® Microcontroller User’s Manual | |||
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Command Sequence:
DUMP (B/W)
???
READ
MEMORY
LOCATION
XXX
âILLEGALâ
NEXT CMD
âNOT READYâ
Debug Support
XXX
âNOT READYâ
NEXT CMD
RESULT
XXX
BERR
NEXT CMD
âNOT READYâ
DUMP (LONG)
???
READ
MEMORY
LOCATION
XXX
âNOT READYâ
NEXT CMD
MS RESULT
NEXT CMD
LS RESULT
Operand Data:
Result Data:
XXX
âILLEGALâ
NEXT CMD
âNOT READYâ
XXX
BERR
NEXT CMD
âNOT READYâ
Figure 30-26. DUMP Command Sequence
None
Requested data is returned as either a word or longword. Byte data is returned in
the least-significant byte of a word result. Word results return 16 bits of significant
data; longword results return 32 bits. A value of 0x0001 (with S set) is returned if
a bus error occurs.
30.5.3.3.6 Fill Memory Block (FILL)
A FILL command is used with the WRITE command to access large blocks of memory. An initial WRITE is
executed to set up the starting address of the block and to supply the first operand. The FILL command
writes subsequent operands. The initial address is incremented by the operand size (1, 2, or 4) and saved
in a temporary register after the memory write. Subsequent FILL commands use this address, perform the
write, increment it by the current operand size, and store the updated address in the temporary register.
If an initial WRITE is not executed preceding the first FILL command, the illegal command response is
returned.
NOTE
The FILL command does not check for a valid addressâFILL is a valid
command only when preceded by another FILL, a NOP, or a WRITE command.
Otherwise, an illegal command response is returned. The NOP command can
be used for intercommand padding without corrupting the address pointer.
The size field is examined each time a FILL command is processed, allowing the operand size to be altered
dynamically.
Command Formats:
Freescale Semiconductor
MCF5282 and MCF5216 ColdFire Microcontroller Userâs Manual, Rev. 3
30-29
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