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PIC18F258-E/LSQTP Datasheet(PDF) 312 Page - Microchip Technology |
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PIC18F258-E/LSQTP Datasheet(HTML) 312 Page - Microchip Technology |
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312 / 402 page ![]() PIC18FXX8 DS41159E-page 310 © 2006 Microchip Technology Inc. POP Pop Top of Return Stack Syntax: [ label ] POP Operands: None Operation: (TOS) → bit bucket Status Affected: None Encoding: 0000 0000 0000 0110 Description: The TOS value is pulled off the return stack and is discarded. The TOS value then becomes the previous value that was pushed onto the return stack. This instruction is provided to enable the user to properly manage the return stack to incorporate a software stack. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode No operation POP TOS value No operation Example: POP GOTO NEW Before Instruction TOS = 0x0031A2 Stack (1 level down) = 0x014332 After Instruction TOS = 0x014332 PC = NEW PUSH Push Top of Return Stack Syntax: [ label ] PUSH Operands: None Operation: (PC + 2) → TOS Status Affected: None Encoding: 0000 0000 0000 0101 Description: The PC + 2 is pushed onto the top of the return stack. The previous TOS value is pushed down on the stack. This instruction allows the user to implement a software stack by modifying TOS and then pushing it onto the return stack. Words: 1 Cycles: 1 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode PUSH PC + 2 onto return stack No operation No operation Example: PUSH Before Instruction TOS = 0x00345A PC = 0x000124 After Instruction PC = 0x000126 TOS = 0x000126 Stack (1 level down) = 0x00345A |
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