6502.h File Reference

#include <Z/hardware/CPU/architecture/6502.h>

Include dependency graph for 6502.h:

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Data Structures
struct	M6502
	6502 emulator instance. More...

Macros
#define	CPU_6502_API   Z_API

Functions
CPU_6502_API void	m6502_power (M6502 *object, zboolean state)
	Changes the CPU power status. More...
CPU_6502_API void	m6502_reset (M6502 *object)
	Resets the CPU. More...
CPU_6502_API zusize	m6502_run (M6502 *object, zusize cycles)
	Runs the CPU for a given number of cycles. More...
CPU_6502_API void	m6502_nmi (M6502 *object)
	Performs a non-maskable interrupt (NMI). More...
CPU_6502_API void	m6502_irq (M6502 *object, zboolean state)
	Changes the state of the maskable interrupt (IRQ). More...

Macro Definition Documentation

CPU_6502_API

#define CPU_6502_API   Z_API

Function Documentation

m6502_power()

CPU_6502_API void m6502_power	(	M6502 *	object,
		zboolean	state
	)

Changes the CPU power status.

Parameters

object	A pointer to a 6502 emulator instance.
state	TRUE = power ON; FALSE = power OFF.

References A, FALSE, IRQ, NMI, P, PC, S, X, Y, Z_6502_VALUE_AFTER_POWER_ON_A, Z_6502_VALUE_AFTER_POWER_ON_P, Z_6502_VALUE_AFTER_POWER_ON_PC, Z_6502_VALUE_AFTER_POWER_ON_S, Z_6502_VALUE_AFTER_POWER_ON_X, and Z_6502_VALUE_AFTER_POWER_ON_Y.

Referenced by C64_LoadPrg().

m6502_reset()

CPU_6502_API void m6502_reset

(

M6502 *

object

)

Resets the CPU.

This is equivalent to a pulse on the RESET line of a real 6502.

Parameters

object

A pointer to a 6502 emulator instance.

References FALSE, IRQ, NMI, P, PC, READ_POINTER, S, Z_6502_VALUE_AFTER_POWER_ON_P, and Z_6502_VALUE_AFTER_POWER_ON_S.

m6502_run()

CPU_6502_API zusize m6502_run	(	M6502 *	object,
		zusize	cycles
	)

Runs the CPU for a given number of cycles.

Parameters

object	A pointer to a 6502 emulator instance.
cycles	The number of cycles to be executed.

Returns

The number of cycles executed.

Note

Given the fact that one 6502 instruction needs between 2 and 7 cycles to be executed, it's not always possible to run the CPU the exact number of cycles specfified.

References CYCLES, FALSE, instruction_table, IP, IRQ, NMI, OPCODE, P, PC, PUSH_16, PUSH_8, READ_8, and READ_POINTER.

Referenced by C64_LoadPrg().

m6502_nmi()

CPU_6502_API void m6502_nmi

(

M6502 *

object

)

Performs a non-maskable interrupt (NMI).

This is equivalent to a pulse on the NMI line of a real 6502.

Parameters

object

A pointer to a 6502 emulator instance.

References NMI, and TRUE.

m6502_irq()

CPU_6502_API void m6502_irq	(	M6502 *	object,
		zboolean	state
	)

Changes the state of the maskable interrupt (IRQ).

This is equivalent to a change on the IRQ line of a real 6502.

Parameters

object	A pointer to a 6502 emulator instance.
state	TRUE = line high; FALSE = line low.

References IRQ.

Referenced by C64_LoadPrg(), and C64_mem_write().