;==================================================================================
; The information contained herein is the exclusive property of
; Sunplus Technology Co. And shall not be distributed, reproduced,
; or disclosed in whole in part without prior written permission.
;       (C) COPYRIGHT 2004   SUNPLUS TECHNOLOGY CO.                                  
;                   ALL RIGHTS RESERVED
; The entire notice above must be reproduced on all authorized copies.
;==================================================================================
																					
;==================================================================================
;	Project Name	:	NMI
;	Applied Body	:	SPMC65P2404A
;	Firmware version:
;	Programer		:
;	Date			:	2005-4-25
;	Description		:	External interrupt set as NMI
;						
;	Hardware Connect:	
;	Link File		:	
;	IDE Version		: 	V1.6.5	
;	BODY Version	:	V1.0.0A
;==================================================================================

.SYNTAX  6502								;Process standard 6502 addressing syntax
.LINKLIST									;Generate linklist information
.SYMBOLS									;Generate symbolic debug information
;************************************************************************************
;*      System Register Define														
;************************************************************************************

;************************************************************************************
.INCLUDE		SPMC65P2404A.inc			;Define all hardware,Registers and ports.		
;************************************************************************************
;************************************************************************************
;*      Data memory Define	                                                        
;************************************************************************************
.PAGE0								;Define values in the range from 00h to FFh
;************************************************************************************
.DATA								;Define data storage section  
;************************************************************************************          
;************************************************************************************
;*      Program Area															
;************************************************************************************
.CODE              
;************************************************************************************
;*      Power on Reset Process	                                                    
;************************************************************************************
;====================================================================================
;	Function Name:	V_Reset
;	Description:	External interrupt description
;	Input:			none
;	Output:         none
;	Destroy:		A
;====================================================================================
.PUBLIC		V_Reset
V_Reset:
		sei									; Disable interrupt
		ldx		#C_STACK_BOTTOM				; Initial stack pointer at $00FF
		txs									; Transfer to stack point  				
F_Main:
		lda		#$FF
		sta		P_IOA_Dir
		lda		#$00
		sta		P_IOA_Attrib
		sta		P_IOA_Data
		
		lda		P_IOD_Buf
		and		#%11111110		
		sta		P_IOD_Data
		lda		P_IOD_Attrib
		and		#%11111110
		sta		P_IOD_Attrib
		lda		P_IOD_Dir
		and		#%11111110				
		sta		P_IOD_Dir					; PortD 0  as input low
		lda		#%00000100
		sta		P_INT_Ctrl0					; INT2 enable bit   
		lda		#%00100000				 
		sta		P_IRQ_Opt1					; Rising edge trigger
		sta		P_IRQ_Opt1 
		lda		#%00000100
		sta		P_INT_Flag0					; clear INT2 flag bit	
L_Loop:
		Nop                                 ; wait INT2
		jmp		L_Loop
	
;************************************************************************************
;*      Interrupt Service Process                 
;************************************************************************************
V_IRQ:   
		rti 										           
V_NMI:
        pha
        txa
        pha        
;-------------------------------
; INT2 service process
;-------------------------------
        lda		P_INT_Flag0
        and		#%00000100                  ; INT2?
        beq		V_NMI_Exit		            ; no						
        nop                                 ; user information		
        lda		#%00000100
        sta		P_INT_Flag0			        ; clear INT2 flag bit 
        lda		#$FF
        sta		P_IOA_Data     
V_NMI_Exit:
        pla
        tax
        pla
        rti

;************************************************************************************
;*      Interrupt Vector Table
;************************************************************************************	
VECTOR		.SECTION
		DW		V_NMI						; Non-mask interrupt vector
		DW		V_Reset						; Reset vector
		DW		V_IRQ						; IRQ interrupt vector
;************************************************************************************
;*      End of Interrupt Vector Table	
;************************************************************************************
.END