is62lv1024new.c

工业以太网测控板资料FX04核心编程模块

//-----------------------------------------------------------------------------
// IS62LV1024.c
//-----------------------------------------------------------------------------
// Copyright 2003 NCD co.ltd
//
// AUTH: Jhonsun
// DATE: 3 Mar 03
//
// This program shows an example of access data from external Sram .
//
// Assumes an 22.1184MHz crystal is attached between XTAL1 and XTAL2.
//
// Target: C8051F02x
// Tool chain:  KEIL EVAL C51
//

//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------

#include <c8051f040.h>                 // SFR declarations
#include <intrins.h>


//#define SYSCLK       22118400          // SYSCLK frequency in Hz


//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------

void SYSCLK_Init (void);
void PORT_Init(void);
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void) {

   unsigned char  idata InBuf[35];
   unsigned long idata i;
   unsigned char idata j;
   unsigned char xdata  *idata Point1;
 SFRPAGE   = CONFIG_PAGE;
   WDTCN = 0xde;                       // disable watchdog timer
   WDTCN = 0xad;

   PORT_Init();
   SYSCLK_Init ();                     // initialize oscillator
   SFRPAGE   = CONFIG_PAGE;
   P4=0xf4;                //P4.3接1024的CE1,P4.4接1024的CE2,P4.0接A16
                           //A16作为分页数据线,A16=0 选择BANK0:0-64K,A16=1 选择BANK1:64-128K
   j=0;
   Point1=0x0000;
   for(i=0;i<0xFFFE;i++)
   {
     j=i/0x1000;
	 *Point1=j;
	 Point1++;
   	 
	 }
	 _nop_();
   SFRPAGE   = CONFIG_PAGE;
	P4++;                //向BANK1送数据
   _nop_();
   _nop_();
   Point1=0x0000;
   for(i=0;i<0xFFFE;i++)
   { j=i/0x1000+0x10;
     *Point1=j;
	 Point1++;
	 }
   _nop_();
  SFRPAGE   = CONFIG_PAGE;
   P4=0xf4;                 //读取BANK0的数据
   _nop_();
   _nop_();
   Point1=0x0000;
   for(i=0;i<16;i++)
   {
    InBuf[i]=*Point1;
	Point1+=0x1000;
	}
  _nop_();
  SFRPAGE   = CONFIG_PAGE;
  P4++;                    //读取BANK1的数据
  Point1=0x0000;
  for(i=16;i<33;i++)
  {
   
   
   InBuf[i]=*Point1;
   Point1+=0x1000;
   }
   while (1);
}

//-----------------------------------------------------------------------------
// Initialization Subroutines
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// This routine initializes the system clock to use an 22.1184MHz crystal
// as its clock source.
//
void SYSCLK_Init (void)
{
    int i ;
	SFRPAGE   = CONFIG_PAGE;
	OSCXCN    = 0x67;
    for (i = 0; i < 3000; i++);  // 等待晶振稳定加的延时
    while ((OSCXCN & 0x80) == 0);
    CLKSEL    = 0x01;
 
}

void PORT_Init()
{
   SFRPAGE   = CONFIG_PAGE;
   XBR2    = 0x40;                     // Enable crossbar and weak pull-ups
   
   SFRPAGE = EMI0_PAGE;
   EMI0TC  = 0x21;                     //
   EMI0CF  =0x2f;           //EMIF端口接到P4－P7，选择复用方式，工作模式为不带块选择。
   SFRPAGE   = CONFIG_PAGE;
   P4MDOUT = 0XFF;
   P5MDOUT = 0xFF;
   P6MDOUT = 0xFF;
   P7MDOUT =0XFF;

}