Crate mc6809_core 

mc6809-core

A Motorola 6809 CPU emulator core.

Provides a Cpu that executes 6809 instructions against any memory system implementing the Memory trait. Peripheral timing and interrupt signals are handled separately via the Clocked trait, which is called by the host loop independently of the CPU.

Example

use mc6809_core::{Cpu, Memory};

struct FlatRam([u8; 65536]);

impl Memory for FlatRam {
    fn read(&mut self, addr: u16) -> u8 { self.0[addr as usize] }
    fn write(&mut self, addr: u16, val: u8) { self.0[addr as usize] = val; }
}

let mut mem = FlatRam([0; 65536]);
// Place a reset vector pointing to 0x0400
mem.0[0xFFFE] = 0x04;
mem.0[0xFFFF] = 0x00;
// Place a NOP at 0x0400
mem.0[0x0400] = 0x12;

let mut cpu = Cpu::new();
cpu.reset(&mut mem);
assert_eq!(cpu.registers().pc, 0x0400);
cpu.step(&mut mem);
assert_eq!(cpu.registers().pc, 0x0401);

Re-exports

pub use memory::Memory;

pub use peripheral::BusSignals;

pub use peripheral::Clocked;

pub use registers::ConditionCodes;

pub use registers::Registers;

Modules

memory

peripheral

registers

Structs

Cpu

Motorola 6809 CPU emulator.

RegistersMut

RAII guard returned by Cpu::registers_mut.

Functions

instruction_cycles

Returns the base cycle count for a 6809 instruction.