Siemens CPU 948 User Manual

9.4.2
Accessing the Local
Memory
Application The following operations allow access to the local memory organized
in words using an absolute memory address. The absolute address is
the sum of the contents of the BR register and the 16-bit constant
contained in the operation (-32768 to +32767).
Operations
Operation Operand Description
LRW
LRD
Constant
(-32768 to
+32767)
Constant
(-32768 to
+32767)
add the specified constant to content
1)
of the BR register and load the word
addressed in this way in ACCU-1-L
add the specified constant to content
1)
of the BR register and load the double
word addressed in this way in ACCU 1
TRW Constant
(-32768 to
+32767)
add the specified constant to content
of the BR register and transfer the
content of ACCU-1-L to the word
addressed in this way
31
xx
00
00
......
......
xx
20
19
0
ACCU 1
MAS, MAB
MSA, MBA
BR,
SAC
BR,
SAC
ACCU 1
31
20
19
0
19
0
19
0
MSB
MBS
SAC
BR
BR
SAC
19
0
19
0
19
0
19
0
Fig. 9-8 Transfer operations from one register to another
Table 9-8 Operations for accessing the local memory
Operations with the Base Address Register (BR Register)
CPU 948 Programming Guide
9 - 24 C79000-G8576-C848-04

Siemens CPU 948 Specifications

General

Brand	Siemens
Model	CPU 948
Category	Controller
Language	English