Siemens CPU 948 - Operations for Transfer between Registers

9.4.1
Operations for
Transfer between Registers
Application You can use the operations described in this section for the fast
exchange of values between the registers ACCU 1 (32 bits), step
address counter (SAC - 20 bits) and BR register (20 bits).
Operations
Operation Operand Function
MAS
MAB
MSA
MSB
MBA
MBS
--
--
--
--
--
---
Transfer the contents of ACCU 1 to
the STEP address counter (20 bits)
Transfer the contents of ACCU 1 to
the base address register (20 bits)
Transfer the contents of the STEP
address counter (20 bits) to ACCU 1
1)
Transfer the contents of the STEP
address counter (20 bits) to the base
address register (20 bits)
Transfer the contents of the base
address register (20 bits) to ACCU 1
1)
Transfer the contents of the base
address register (20 bits) to the STEP
address counter (20 bits)
1)
Bits 2
20
to 2
31
are set to ’0’.
The following figure illustrates how the registers are changed by the
operations.
Table 9-7 Register-register operations
Operations with the Base Address Register (BR Register)
CPU 948 Programming Guide
C79000-G8576-C848-04
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