[PDF] 6502 brk opcode

  • How many opcodes in 6502?

    Of the 256 possible opcodes available using an 8-bit pattern, the original 6502 uses 151 of them, organized into 56 instructions with (possibly) multiple addressing modes. Depending on the instruction and addressing mode, the opcode may require zero, one or two additional bytes for operands.

  • What is BRK 6502?

    A note on the BRK opcode ------------------------ Regardless of what ANY 6502 documentation says, BRK is a 2 byte opcode. The first is #$00, and the second is a padding byte. This explains why interrupt routines called by BRK always return 2 bytes after the actual BRK opcode, and not just 1.

  • What is the 6502 ADC instruction?

    The 6502 has an 8-bit addition operation ADC (add with carry) which adds two numbers and a carry-in bit, yielding an 8-bit result and a carry out bit. The following diagram shows an example addition in binary, decimal, and hexadecimal.
  • The interrupt latency on the 6502 is definitely one of the very fastest in the 8-bit world. The interrupt sequence takes 7 clocks and the RTI takes 6, so the overhead is only 13 clocks.
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OpenCores 6502 IP Core Specification

15 sept. 2018 R6502 IP Core ... Figure (2): R6502_TC IP core architecture . ... If an NMI occurred after a BRK instruction was fetched and before the ...



W65C02S Microprocessor DATA SHEET

The Operation Code (OpCode) portion of the instruction is loaded into the The BRK instruction for both the NMOS 6502 and 65C02 is a 2 byte instruction.



W65C02S 8–bit Microprocessor

8 avr. 2022 The Operation Code (OpCode) portion of the instruction is loaded into ... The BRK instruction for both the NMOS 6502 and 65C02 is a 2 byte ...



W65C02S 8–bit Microprocessor

8 oct. 2018 3.13 SYNCHRONIZE WITH OPCODE FETCH (SYNC) . ... The BRK instruction for both the NMOS 6502 and 65C02 is a 2 byte instruction.



6502-6809 TRANSLATOR - by Edgar M. (Bud) Pass Ph.D

The 6502 BRK instruction has no exact 6809 counterpart with respect to the "B" flag in the condition code register. However if 6502 stack emulation and 



R65C02 R65C102 and R65C112 R65C00 Microprocessors (CPU)

Pin compatible with NMOS R6502 (2) R6502 instruction with additional addressing mode(s). ... BRK. O? Implied. 1 7. R65C00 Microprocessors (CPU).



6502 Interrupt and Bus

Computer Systems Fundamentals: 6502 Interrupt and Bus. 23 September 2019 Software Interrupt: caused by BRK instruction (sets break flag).



Programming the 65816

Including the 6502 65C02 and 65802 6502/65C02 Addressing Modes on the 65816. ... 1= software interrupt (BRK) instruction).



20 Interrupts and Breaks

There is an instruction in the Apple /I's 6502 instruction set which allows a software type of interrupt to be generated - this instruction is: BRK.



W65C02S DATA SHEET

6 mars 2000 Table 5-1 W65C02S Instruction Set-Alphabetical Sequence. ... The BRK instruction for both the NMOS 6502 and 65C02 is a 2 byte instruction.

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