STEP 5 Operations S5-115F Manual
3.3.2 Load and Transfer Operations
Use these load and transfer operations to address the entire program memory of the CPU. They
are used mainly for data exchange between the accumulator and memory locations that cannot
be addressed by operands. Table 3-27 provides an overview of the load and transfer operations.
Note
Load and transfer operations may only access memory area B000
H
to C3FF
H
(LIR, TIR,
TNB).
Table 3-27. Overview of Load and Transfer Operations
Operation MeaningOperand
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LIR Load the register indirectly.
The contents of the memory word whose address is in ACCUM 1 are
loaded into the specified register.
TIR Transfer the register indirectly.
The contents of the indicated register are transferred to the
memory location whose address is in ACCUM 1.
Parameter
0 (for ACCUM 1), 2 (for ACCUM 2)
TNB Transfer a data block (byte by byte).
A memory area is transferred in the program memory as a block:
ACCUM 1 = Destination address
ACCUM 2 = Source address
Parameter = Length in bytes
T Transfer
A word is transferred to the system data range.
Parameter = Word No. in system data area.
Parameter
0 to 255
ID
(System data) BS
Loading and transferring register contents
Both accumulators can be addressed as registers. Each register is 16 bits wide. Since the ”LIR” and
”TIR” operations transmit data by words, the S5-115F registers are addressed in pairs.
Loading and transferring register contents are independent of the RLO. The processor goes to
ACCUM 1 to get the address of the memory location referenced during data exchange.
Consequently, make sure that the desired address is stored in ACCUM 1 before this system
operation is processed.
3-66
EWA 4NEB 811 6149-02
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