Freescale Semiconductor MCF51QE128RM manual 0x33, Xcsrsb, 0x37, 0x3B, Freescale Semiconductor 395

Chapter 18 Version 1 ColdFire Debug (CF1_DEBUG)

				DUMP_MEM.sz_WS
Read memory specified by debug address register with status,									Non-intrusive
then increment address
	0x33		XCSR_SB	Memory
				data[7-0]
	host →	D	target →	target →
	target	L	host	host
		Y
	0x37		XCSR_SB	Memory		Memory
				data[15-8]		data[7-0]
	host →	D	target →	target →		target →
	target	L	host	host		host
		Y
	0x3B		XCSR_SB	Memory		Memory		Memory	Memory
				data[31-24]	data23-16]		data[15-8]		data[7-0]
	host →	D	target →	target →		target →		target →	target →
	target	L	host	host		host		host	host
		Y

DUMP_MEM{_WS} is used with the READ_MEM{_WS} command to access large blocks of memory. An initial READ_MEM{_WS} is executed to set-up the starting address of the block and to retrieve the first result. If an initial READ_MEM{_WS} is not executed before the first DUMP_MEM{_WS}, an illegal command response is returned. The DUMP_MEM{_WS} command retrieves subsequent operands. The initial address is incremented by the operand size (1, 2, or 4) and saved in a temporary register. Subsequent DUMP_MEM{_WS} commands use this address, perform the memory read, increment it by the current operand size, and store the updated address in the temporary register. If the with-status option is specified, the core status byte contained in XCSR[31–24] (XCSR_SB) is returned before the read data. The XCSR status byte reflects the state after the memory read was performed.

NOTE

DUMP_MEM_{WS} does not check for a valid address; it is a valid command only when preceded by NOP, READ_MEM_{WS}, or another DUMP_MEM{_WS} command. Otherwise, an illegal command response is returned. NOP can be used for inter-command padding without corrupting the address pointer.

The size field (sz) is examined each time a DUMP_MEM{_WS} command is processed, allowing the operand size to be dynamically altered. The examples show the DUMP_MEM.B{_WS}, DUMP_MEM.W{_WS} and DUMP_MEM.L{_WS} commands.

18.4.1.5.6 FILL_MEM.sz, FILL_MEM.sz_WS

FILL_MEM.sz
Write memory specified by debug address register, then	Non-intrusive
increment address

MCF51QE128 MCU Series Reference Manual, Rev. 3

Freescale Semiconductor 395

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