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7.2.8.6 Read System Register (RSREG)
The specified system control register is read. All registers that can be read in supervisor mode can be read in BDM. Several internal temporary registers are also accessible.
Command Format:
15
14
13
12
11
10
9
8
7
6
5
4
0
0
1
0
0
1
0
0
1
0
0
0
3
0
REGISTER
Command Sequence:
RSREG
???
XXX
MS RESULT
NEXT CMD
LS RESULT
XXX
"ILLEGAL"
NEXT CMD
"NOT READY"
Operand Data:
None
Result Data:
Always returns 32 bits of data, regardless of the size of the register being read. If
the register is less than 32 bits, the result is returned zero extended.
Register Field:
The system control register is specified by the register field according to the following table:
System Register
Return Program Counter (RPC)
Current Instruction Program Counter (PCC)
Status Register (SR)
User Stack Pointer (USP)
Supervisor Stack Pointer (SSP)
Source Function Code Register (SFC)
Destination Function Code Register (DFC)
Temporary Register A (ATEMP)
Fault Address Register (FAR)
Vector Base Register (VBR)
Select Code
0000
0001
1011
1100
1101
1110
1111
1000
1001
1010
7.2.8.7 Write System Register (WSREG)
Operand data is written into the specified system control register. All registers that can
be written in supervisor mode can be written in BDM. Several internal temporary registers are also accessible.
Command Format:
MOTOROLA
7-16
DEVELOPMENT SUPPORT
CPU32
REFERENCE MANUAL