http://tech.groups.yahoo.com/group/picmicrodevelopersforum/ PIC Micro Developers' Forum - Microchip PIC Microcontrollers Discussion Forum Tue, 29 Dec 2009 13:38:33 GMT Fournier, Pete http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1861 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1861 I once had (probably still have) an issue with a 16 bit write to an eeprom. If the low byte/high byte crossed an 8 bit address location (ie one byte in 0xbf Sun, 27 Dec 2009 12:46:45 GMT Ian http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1860 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1860 Seems to me there is something in the state after the call that is causing the problem or conversely something you assume about the state at the beginning of Sun, 27 Dec 2009 09:42:37 GMT Kevin http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1859 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1859 Hi Mike, My "2 pence" (2 cents?) worth on the subject is .... whenever I've had EEPROM problems it usually turned out to be BANK errors, e.g. I've changed BANK Sat, 26 Dec 2009 20:32:58 GMT Mike http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1858 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1858 I wanted to bring everyone up to date on my ongoing saga with EEPROM in a 16F627A. I thought I had it working, but quickly discovered that THE ORDER OF Tue, 22 Dec 2009 17:42:05 GMT Mike Dodd http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1857 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1857 Jonathan wrote:> Mike, ... I got it working. I made a new source code file that does nothing but read the pushbutton and write/read the EEPROM. I did find the Tue, 22 Dec 2009 16:17:09 GMT Jonathan http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1856 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1856 Mike, I didn't see any problems in the EEPROM read and write routines, but I did spot a few things, below... Merry Christmas, Jonathan ... Mon, 21 Dec 2009 21:24:19 GMT Mike Dodd http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1855 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1855 ... Thanks for the suggestion. I modified my code to write to two EEPROM locations. Now it appears that the EEPROM is not being written, and is returning Mon, 21 Dec 2009 13:08:44 GMT bergweed http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1854 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1854 My guess is the EEMEM isn't really being written to and you are just reading back the contents of the EEDATA register containing what was supposed to be Sun, 20 Dec 2009 18:38:35 GMT orwill@... http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1853 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1853 You can get the data sheet from the microchip website. The oscillator will operate up to 20 mhz. The instruction cycle is 1/4 of that so the instruction cycle Sun, 20 Dec 2009 18:03:35 GMT Willem http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1852 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1852 Hello everybody, How can i find whit speed a 16F688 is i can't find anything on the PIC but like to know if it is a 4 or 20 MHz. thanks Willem Sun, 20 Dec 2009 03:35:05 GMT Mike http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1851 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1851 I'm having a major problem with 16F627A EEPROM. I can write data to a location in EEPROM, and read it back okay, but if I subsequently turn off the power Sat, 14 Nov 2009 02:31:40 GMT bergweed http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1848 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1848 Mike, Here's my 16F627/8 asm sub to read and write the EEMEM. the address goes in variable ee_addr and the data comes/goes in ee_data. If you aren't using Thu, 12 Nov 2009 21:19:32 GMT jonw0224@... http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1847 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1847 Mike, Here is code I've tested on a 16F84(A) and 16F877(A). variable CURRENTBANK CURRENTBANK set 0x0000 ;*Sets the STATUS bits RP0 and RP1 correctly depending Thu, 12 Nov 2009 19:41:11 GMT Mike Dodd http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1846 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1846 ... Thanks. The only significant difference between your routine and mine is that yours checks at the start for the previous write complete, and mine does this Thu, 12 Nov 2009 03:52:06 GMT orwill@... http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1845 http://tech.groups.yahoo.com/group/picmicrodevelopersforum/message/1845 Hi Mike, This is one of my write subroutines for a PIC 18FXXX device. I think its similar maybe the movf instruction is different anyway this works perfectly