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Instruction Cycle RTI

Instruction Cycle RTI - MAR R6 MDR memory[MAR PC MDR R6 R6...

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RTI (1000) Instruction Cycle Instruction Fetch MAR PC PC PC + 1 MDR memory[MAR] IR MDR Decode IR[15:12] decoded Evaluate Address n/a Operand Fetch n/a Execute if (! PSR[15] ) { /* pop the (supervisor) stack into PSR */ MAR R6 MDR memory[MAR] PSR MDR R6 R6 + 1 /* pop the (supervisor) stack into PC
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Unformatted text preview: */ MAR R6 MDR memory[MAR] PC MDR R6 R6 + 1 /* reset stack pointer if switching back to user mode */ if ( PSR[15] ) { Saved.SSP R6 R6 Saved.USP } } else Raise a privilege mode exception Store Result n/a...
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