??? 10/10/05 13:14 Read: times |
#102168 - Software Based RTC |
Hello,
IN the article published in this website about designing a software based RTC I have a confusion on the statements put forth. Cut and pasting the same for everyone's understanding here ... " In the tutorial published in the 8052 website I found the following sentences which are contradicting "This means we can't simply count the number of overflows from it counting from 0 to 65536. We'll be introducing even more inaccuracy. In the case of an 11.0592Mhz crystal, this inaccuracy will be about 0.44%, but if we were to use this same program with a 12.000Mhz crystal, the inaccuracy would be 1.70% which is much worse. Other crystal frequencies could result in even less accuracy. Generally, the slower the crystal, the more pronounced the error will be-and the error can easily become significant." So here I am unable to understand whether using higher frequency will reduce the error or using lower frequency and also how is this percentage derived? Thanks, |
Topic | Author | Date |
Software Based RTC | 01/01/70 00:00 | |
Context | 01/01/70 00:00 | |
Link to my RTC - sftware crystal freq. | 01/01/70 00:00 | |
The precision is depending on the fracti | 01/01/70 00:00 | |
How to count seconds | 01/01/70 00:00 | |
How to decide count for a 3.5795Mhz, | 01/01/70 00:00 | |
the frequency range does not matter | 01/01/70 00:00 | |
the "tricks" | 01/01/70 00:00 | |
3.93216MHz is better | 01/01/70 00:00 | |
4.915200 | 01/01/70 00:00 | |
3.93216 ?? | 01/01/70 00:00 | |
3.93216 is standard frequency | 01/01/70 00:00 | |
Can i have some clarifications on XTALS | 01/01/70 00:00 | |
manufacturing tolerances | 01/01/70 00:00 | |
low frequencies Crystals are bigger ? | 01/01/70 00:00 | |
32.768kHz means low current consumption | 01/01/70 00:00 | |
so higher Frequeny crystals are accurate | 01/01/70 00:00 | |
Yes!![]() | 01/01/70 00:00 | |
The Right Frequency | 01/01/70 00:00 |