| ??? 10/09/04 10:36 Read: times |
#79071 - That cannot work! Responding to: ???'s previous message |
Erik said:
If your map is in eeprom all is lost. Reading eeprom is waaaay too slow. Excat, if it's assumed that you mean 'serial EEPROM'. Farrukh, simply stated: You want to run something fast, but you only use slow components! That cannot work!! You cannot expect a flickering free display of 18 (!) digits, when using serial EERPOM as buffer, serial shift register in the driver and eventually wasted time by coding in C. This cannot work! You must go the other way: FIRST analyze what minimum refreshing rate must be, THEN choose the right components, like buffer in CMOS RAM (or maybe parallel EEPROM) organized in bytes (!) and parallel addressing the display driver organized in bytes (!). Remember, your micro is an 8-bit machine! If you then find that there's enough headroom with your timing, then you can think about using serial working components to reduce number of components... I know some of these multi-digit LED displays. These parts are highly sophisticated master pieces. And you cannot assume that you can achieve the same performance by using a tiny serial EEPROM and a shift register! Kai |
