60 lines
2.7 KiB
Plaintext
60 lines
2.7 KiB
Plaintext
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9. Command of the loading of the LOAD register.
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══════════════════════════════════════════
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The given command differs from all other commands of accembler, because it
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assigns the loading of the official registers, that refer to many nodes of the
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complex of the microprocessor. Depending on the operand that follows after the
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command, it can be with one or two operands:
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1)The loading of the register of the inputting of the operand of the block
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of the ALU:
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LOAD RA;
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LOAD RB;
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the given command does not require as second operand to indicate the
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source of the loading or direct operand, because as hardware registers
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are connected to data bus and after presenting the signal record the
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value will be loaded in them, which is at present found on bus.
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2)loading of registers of the marks of the controller of shifts:
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LOAD RM;
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LOAD RN;
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here as the second operand it is possible to indicate necessary values:
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1)Z - loading in all four marks the register of the zeroes;
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2)NZ- loading in all four marks the register of the numeral;
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3)FLAGS - loading in registers signs of execution of last
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operation in block ALU; with using the operator of the modification
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@ flags will be loaded in modified type (refer to table of the
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loading registers of marks);
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besides it is possible to load one register by another. The Examples:
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LOAD RM,Z;
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LOAD RN,RM;
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XOR R1,R5;
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LOAD RM,FLAGS;
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The rest of the types of the loading of registers of marks are available
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when the command FIELD is in a use.
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3)The loading of the registers of the mask and conditions of the block of
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the processing of the interruptions.
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The Command can be with one or two operands. The Difference is that in
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one operanded command registers are loaded by current information from
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data bus while under direct inputting of the operand of the loading, it
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is brought in the data field of microinstruction and is read on data bus
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from there. For instance:
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LOAD SR,7; \register of the condition is with 3 digits,
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\remember that attempt to load there number
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\greater then 7 will cause a mistake\
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INC R1;
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LOAD MR; \load in register of the mask
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\the incremented value of the register
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\R1(more exactly the younger 8 digits)
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