Freescale Semiconductor, Inc.
Table 5-23. BDM Command Summary
Command
Mnemonic
Description
Read A/D Register
Read the selected address or data register and return the results
via the serial interface.
RAREG/RDREG
Write A/D Register
The data operand is written to the specified address or data
register.
WAREG/WDREG
RSREG
Read System Register
Write System Register
Read Memory Location
The specified system control register is read. All registers that can
be read in supervisor mode can be read in BDM.
The operand data is written into the specified system control
register.
WSREG
Read the sized data at the memory location specified by the long-
word address. The SFC register determines the address space
accessed.
READ
Write Memory Location
Dump Memory Block
Write the operand data to the memory location specified by the
long-word address. The DFC register determines the address
space accessed.
WRITE
DUMP
Used in conjunction with the READ command to dump large blocks
of memory. An initial READ is executed to set up the starting
address of the block and to retrieve the first result. Subsequent
operands are retrieved with the DUMP command.
Fill Memory Block
Used in conjunction with the WRITE command to fill large blocks of
memory. An initial WRITE is executed to set up the starting
address of the block and to supply the first operand. Subsequent
operands are written with the FILL command.
FILL
Resume Execution
Call User Code
Reset Peripherals
No Operation
The pipeline is flushed and refilled before resuming instruction
execution at the return PC.
GO
CALL
RST
Current PC is stacked at the location of the current SP. Instruction
execution begins at user patch code.
Asserts RESET for 512 clock cycles. The CPU is not reset by this
command. Synonymous with the CPU RESET instruction.
NOP performs no operation and may be used as a null command.
NOP
5.6.2.8.4 Read A/D Register (RAREG/RDREG). Read the selected address or data
register and return the results via the serial interface.
Command Format:
15
0
14
0
13
1
12
0
11
0
10
0
9
0
8
1
7
1
6
0
5
0
4
0
3
2
1
0
A/D
REGISTER
Command Sequence:
RDREG/RAREG
???
XXX
MS RESULT
NEXT CMD
LS RESULT
XXX
NEXT CMD
"ILLEGAL"
"NOT READY"
Operand Data:
None
5- 76
MC68340 USER’S MANUAL
MOTOROLA
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