Sam Linder [SamL at IN-INC.COM] says:
The following routines work for the 16F874/16F877 - not sure about the 16F871.// ************************************************** // Function Name: Read8BitDataFromEEprom // // Description: Read characterization data out of on-board EEPROM // // Inputs: // eeaddress: 8-bit EEPROM address to read // // Outputs: // 8-bit data stored at EEPROM address // unsigned char Read8BitDataFromEEprom(unsigned char eeaddress) { eeaddress &= 0x7F; eeadr = eeaddress; eepgd = 0; rd = 1; return(eedata); } // end of Read8BitDataFromEEprom() // ************************************************** // Function Name: Write8BitDataToEEprom // // Description: write 8-bit characterization data to on-board EEPROM // // Inputs: // data_address: 8-bit EEPROM address // datavalue: 8-bit data // // Outputs: none // void Write8BitDataToEEprom(unsigned char data_address, unsigned char datavalue) { data_address &= 0x7F; eeadr = data_address; // establish address to write to eedata = datavalue; // get data to write eepgd = 0; // set for access to data memory wren = 1; // set eeprom write enable bit //gie = 0; #asm retry: bcf INTCON,GIE // disable interrupts for write sequence btfsc INTCON,GIE // make sure bit cleared goto retry // (int could have occurred 1/2way thru instruction) #endasm eecon2 = 0x55; // required eecon2 = 0xAA; // write wr = 1; // sequence gie = 1; // ok to re-enable interrupts do { // wait for write to complete ; // nothing } while(wr); wren = 0; // clear eeprom write enable bit eeif = 0; // clear write complete interrupt flag } // end of Write8BitDataToEEprom()
Questions:
file: /Techref/microchip/16f87xeeprom.htm, 2KB, , updated: 2003/5/8 12:52, local time: 2024/11/26 05:53,
owner: MRL-FAU-IAA,
18.117.99.192:LOG IN
|
©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions? <A HREF="http://sxlist.com/Techref/microchip/16f87xeeprom.htm"> PIC Microcontoller Memory Method </A> |
Did you find what you needed? |
Welcome to sxlist.com!sales, advertizing, & kind contributors just like you! Please don't rip/copy (here's why Copies of the site on CD are available at minimal cost. |
Welcome to sxlist.com! |
.