Notice ERARD 6502

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Notice

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ERARD 6502

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Extrait du mode d'emploi ERARD 6502

Les instructions détaillées pour l'utilisation figurent dans le Guide de l'utilisateur.

127 Restart. 129 Interrupt Considerations. 129 RTI— Return from Interrupt. 132 Software Polling for InterruptCauses. 137 Fully Vectored Interrupts. 140 JMP Indirect. 141 Interrupt Summary. 142 Non-Maskable Interrupt. 142 BRK— Break Command. 144 Memory M a p. 146 CHAPTER 10 SHIFT AND MEMORY MODIFY INSTRUCTIONS 10. 9 Definition of Shift and R o t a t e. 147 LSR— Logical Shift Right. 148 ASL— Arithmetic Shift L e f t. 149 R0L— Rotate L e f t. 149 ROR— Rotate Right. 150 Accumulator Mode Addressing. 150 Read/Modify/Write Instructions. 151 INC— Increment Memory by O n e. 154 DEC— Decrement Memory by O n e. 155 General Note on Read/Modify/Write Instructions. 155 CHAPTER 11 PERIPHERAL PROGRAMMING 11. 2 Review of MCS6520 for 1/0 Operations. 156 MCS6520 Interrupt Control. 158 Implementation Tricks for Use of the MCS6520 Peripheral Interface Devices. 161 11. 1 Shortcut Polling Sequences. 161 11. 2 Bit Organization on MCS6520s. 162 11. 3 Use of READ/MODIFY/WRITE Instruction for Keyboard Encoding. 163 11. 3 MCS6530 Programming. 166 11. 1 Reading of the Counter Register. 166 11. 4 How to Organize to Implement Coding. 166 11. 1 Label Standards. 168 11. 5 Comprehensive 1/0 Program. 170 v APPENDICES A. Instruction List, Alphabetic by Mnemonic, Definition of Instruction Groups. A-l MCS6501 - MCS6505 Microprocessor Instruction Set— Alphabetic Sequence. A-2 A. [...] 15 LDX— Load Index Register X from M e m o r y. 96 LDY— Load Index Register Y from M e m o r y. 96 STX— Store Index Register X in Memory. 97 STY— Store Index Register Y in Memory. 97 INX— Increment Index Register X by O n e. 97 INY— Increment Index Register Y by O n e. 97 DEX— Decrement Index Register X by O n e. 98 DEY— Decrement Index Register Y by O n e. 98 CPX— Compare Index Register X to Memory. 99 CPY— Compare Index Register Y to Memory. 99 Transfers Between the Index Registers and Accumulator. 100 TAX— Transfer Accumulator to Index X. 100 TXA— Transfer Index X to Accumulator. 100 TAY— Transfer Accumulator to Index Y. 101 TYA— Transfer Index Y to Accumulator. 101 Summary of Index Register Applications andManipulations. 102 CHAPTER 8 STACK PROCESSING 8. 13 Introduction to Stack and to Push DownStack Concept. 103 JSR— Jump to Subroutine. 104 RTS— Return from Subroutine. 108 Implementation of Stack in MCS6501 ThroughMCS6505. 112 Summary of Stack Implementation. 115 Use of the Stack by the Programmer. 116 PHA— Push Accumulator on S t a c k. 117 PLA— Pull Accumulator from S t a c k. 118 Use of Pushes and Pulls to CommunicateVariables Between Subroutine Operations. 119 TXS— Transfer Index X to Stack Poin t e r. 120 TSX— Transfer Stack Pointer to Index X. 122 Saving of the Processor Status. 122 PHP— Push Processor Status on Stack. 122 PLP— Pull Processor Status from Stack. 123 Summary on the S t a c k. 123 iv CHAPTER 9 RESET AND INTERRUPT CONSIDERATIONS 9. 12 Vectors. 124 Reset or R e s t a r t. 125 Start Function. [...]..

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