SA Register:
SAC = STEP Address
Counter
On completion of the operation, the 20-bit absolute address of the
operation to be processed next is entered in the SA register.
BA Register:
Block Start Address
During program processing of the STEP 5 user program, a 20-bit
absolute address is entered in the BA register. This address is in the
higher order block (corresponds to the return address). It is the address
of the operation to be processed next.
BR Register:
Available Base Address
Register
The base address register (20 bits) allows you to calculate addresses
and to execute indirect load and transfer operations without using the
ACCUs for the address. It can be used freely during STEP 5 program
processing.
Example of TDI in the byte
area
:L DH 1234 5678 Load data
:L DH 000E FC00 Load address of flag
: byte FY 0
:TDI A2 Store content of ACCU 2
E FC00 = 34 (The values ’12H’ and ’56H’ from
E FC01 = 78 ACCU 2 are lost)
Memory Access via Address in ACCU 1
CPU 948 Programming Guide
9 - 18 C79000-G8576-C848-04
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