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cpu.h File Reference

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Detailed Description

Header file for cpu.c

Definition in file cpu.h.

Go to the source code of this file.

Data Structures
struct	Regs
	Registers. More...
Typedefs
typedef unsigned int	UINT
Functions
void	Reset ()
	Reset interrupt.
void	Irq ()
	IRQ interrupt.
void	Nmi ()
	NMI interrupt.
UINT	InstrStep ()
	Executes one instruction on adress stored in regs.PC.
Regs *	GetRegs ()
void	SetRegs (Regs r)
Variables
unsigned char(*	memgetb )(UINT adr)
void(*	memsetb )(UINT adr, unsigned char byte)

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Function Documentation

UINT InstrStep (    )

Executes one instruction on adress stored in regs.PC. Executes one instruction on adress stored in regs.PC; increments (or changes in case of jump) program counter Returns : Number of cycles consumed Todo: Add undocumented instructions Definition at line 706 of file cpu.c.

void Irq (    )

IRQ interrupt. Adds actual position and the P register (flags) to the top of the stack, sets the I (interrupt) flag to 1 and jumps to the IRQVKT, reset initialization routine. Definition at line 1379 of file cpu.c.

void Nmi (    )

NMI interrupt. Adds actual position and the P register (flags) to the top of the stack, sets the I (interrupt) flag to 1 and jumps to the NMIVKT, reset initialization routine. Definition at line 1398 of file cpu.c.

void Reset (    )

Reset interrupt. Zeroes A, X, Y registers, resets stack pointer S, initializes P register (zeroes all flags except I, which is set to 1) and jumps to the RESETVKT, reset initialization routine. Definition at line 1362 of file cpu.c.

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