external flash memory

Do you have a question? Post it now! No Registration Necessary

Translate This Thread From English to

hello,

i am doing a project on Mc9s12a128b and using external flash memory
m29f040b (two of them)so need to know how to write data into flash.
#############
getting write,chip select and read signals.PLD is used to selct the
external flash memeory.
##########
register settings
MODE = 0xEAL;/*writing values to mode register to choose the mode and
set EMK bit*/
MISC = 0x0DL;/*to stretch the clock cycles*/
PPAGE = 0x00L;/*page value into PPAGE register*/
PEAR = 0x0CL; /*port E assignment register*/
PUCR = 0x90L;/*pull up control register to enable input pins*/
EBICTL = 0x01L;/*EXTERNAL BUS INTERFACE CONTROL REGISTERS*/
PORTK = 0x40L;/*select the external chip for external accesses and
made it X40 from X80*/
//PORTK = 0x60L;
CSCTL0=0x3F;
CSCTL1=0x3D;
CSSTR0=0x3E;
CSSTR1=0x3F;
WINDEF=WINDEF | 0xC0;
PORTE = 0x10L;

PORTA = 0xFF;
PORTB = 0xFF;

******************
flash write function:addr1 is sent the ext flash address
void  FlashWrite1(volatile unsigned short *addr1,volatile unsigned
short *addr11,unsigned short ucVal )
{

unsigned short volatile *addr2;
addr2=(unsigned short volatile *)0x0FF0;
//(*addr2)=0x7F12;
//&addr2=0x7F12;
///addr2=&ucVal;
//*addr2=0x03;
*addr2=ucVal;

*addr1=*addr2;/* writing into required address*/
*addr11=*addr2;/*writing into int flash*/

}

thank u in advance for the help
ranjita,
blore,india

Site Timeline