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Operand Data:
The data to be written into the register is always supplied as a 32-bit long
word. If the register is less than 32 bits, the least significant word is used.
Result Data:
"Command complete" status is returned when register write is complete.
Register Field:
The system control register is specified by the register field according to the
following table. The FAR is a read-only register - any write to it is ignored.
System Register
Select Code
Return Program Counter (RPC)
0000
Current Instruction Program Counter (PCC)
0001
Status Register (SR)
1011
User Stack Pointer (USP)
1100
Supervisor Stack Pointer (SSP)
1101
Source Function Code Register (SFC)
1110
Destination Function Code Register (DFC)
1111
Temporary Register A (ATEMP)
1000
Fault Address Register (FAR)
1001
Vector Base Register (VBR)
1010
7.2.8.8 Read Memory Location (READ)
Read the sized data at the memory location specified by the long-word address.
Only absolute addressing is supported.
The SFC register determines the
address space accessed. Valid data sizes include byte, word, or long word.
Command Format:
15
14
13
12
11
10
9
8
7
6
5
4
3
o
0 1 0 1 0 1 1 1 1 1 0 1 0 1 1
OPSIZE
0 1 0 1 0 1 0 1 0 1 0 1
MOTOROLA
7-22
DEVELOPMENT
SUPPORT
CPU32 REFERENCE MANUAL
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