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18 Cards in this Set
- Front
- Back
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Assembler |
Translates assembly language into machine code for execution |
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Add |
Add the contents of the memory address to the accumulator |
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Sub - subtract |
Subtract the contents of the memory address from the accumulator |
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STA - store |
Store the value in the accumulator in the memory address given |
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LDA - load |
Load the accumulator with the contents of the memory address given |
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BRA - branch (unconditional) |
Branch - uses address given as the address of the next instruction |
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BRZ - branch if zero (conditional) |
Branch to the address given if the accumulator is zero |
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BRP - branch of positive (conditional) |
Branch to the address given if the accumulator is zero or positive |
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Inp |
Input into accumulator |
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Out |
Output contents of accumulator |
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Hlt |
Halt stops the execution of the program |
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Dat |
Data - used to indicate a location that contains data |
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Addressing modes |
Immediate Direct Indirect Indexed |
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Where is the addressing mode in code |
In opcode - basic operation and two digit code represent the addressing mode |
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Immediate addressing |
The operand is the actual value to be operated on |
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Direct addressing |
Operand holds the memory address of the value to be operated on |
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Indirect addressing |
Operand is the location (typically a register) which holds the address of the data we want ^enables larger range of locations |
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Indexed addressing |
The address of the operand is obtained by adding to the contents of a general register (index register) a constant value Used to access an array whose elements are in successive memory locations |
