04-19-2011, 04:10 AM
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Solution
Four types of instructions are supported by the SRC
Type A
Type A is used for only two instructions:
Number of instructions
Addressing mode
Two instructions
• No operation or nop
• Stop operation stop
Both of these instructions do not need an operand (are 0-operand instructions).
Type B
Number of instructions
Addressing mode
Type B format includes three instructions; all three use relative addressing mode
• ldr instruction, used to load register from memory using a relative address
• The lar instruction, for loading a register with relative address
• The str is used to store register to memory using relative address
The effective address is computed at run-time by adding a constant to the PC. This makes the instructions ‘re-locatable’.
Type C
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Solution
Four types of instructions are supported by the SRC
Type A
Type A is used for only two instructions:
Number of instructions
Addressing mode
Two instructions
• No operation or nop
• Stop operation stop
Both of these instructions do not need an operand (are 0-operand instructions).
Type B
Number of instructions
Addressing mode
Type B format includes three instructions; all three use relative addressing mode
• ldr instruction, used to load register from memory using a relative address
• The lar instruction, for loading a register with relative address
• The str is used to store register to memory using relative address
The effective address is computed at run-time by adding a constant to the PC. This makes the instructions ‘re-locatable’.
Type C