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7.2.8.3 Command Set Summary
The BDM command set is summarized in Table 7-4. Subsequent paragraphs contain
detailed descriptions of each command.
Command
Read A/D Register
Write A/D Register
Read System Register
Write System Register
Read Memory Location
Write Memory Location
Dump Memory Block
Fill Memory Block
Resume Execution
Call User Code
Reset Peripherals
No Operation
MOTOROLA
7-14
Table 7-4 BDM Command Summary
Mnemonic
RAREG/RDREG
Read the selected address or data register and return
the results via the serial interface.
WAREG/WDREG
The data operand is written to the specified address or
data register.
RSREG
The specified system control register is read. All
registers that can be read in supervisor mode can be
read in BDM.
WSREG
The operand data is written into the specified system
control register.
READ
Read the sized data at the memory location specified
by the long-word address. The source function code
register (SFC) determines the address space
accessed.
WRITE
Write the operand data to the memory location
specified by the long-word address. The destination
function code register (DFC) register determines the
address space accessed.
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
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.
GO
The pipeline is flushed and refilled before resuming
instruction execution at the return PC.
CALL
Current PC is stacked at the location of the current SP.
Instruction execution begins at user patch code.
RST
Asserts RESET for 512 clock cycles. The CPU is not
reset by this command. Synonymous with the CPU
RESET instruction.
NOP
NOP performs no operation and may be used as a null
command.
DEVELOPMENT SUPPORT
Description
REFERENCE MANUAL
CPU32
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