| ??? 01/16/08 21:27 Read: times |
#149608 - Andy, read my post Responding to: ???'s previous message |
I think that the reason that
The LPC952 is just marginally within spec; The LPC954 is just marginally out-of-spec. is not 'spec' but modifying the trim (RC oscillator tuning). You are supposed to keep your little sausages away from all TRIM bits except 6 and 7 which has differnt functions. if e.g. one is factory adjusted to 0x05 and the other is factory set at 0x36 changing one will have little effect, changing the other will have a large effecr. Thus I now believe that a 0x04 is a mistype for 0x40. 0x04 changes the clock frequency adjustment 0x40 does not change the clock (it selects "low power"). Philips/NXP factory set the reset value of TRIM to make the clock be within 1% of stated freq at room temp (within 2.5% over the temp range). Erik |
| Topic | Author | Date |
| Serial communication problem | 01/01/70 00:00 | |
| have you heard of formatting and comments? | 01/01/70 00:00 | |
| I am sorry about formatting | 01/01/70 00:00 | |
| if you remove the ISR and leave EA in, the uC will | 01/01/70 00:00 | |
| I removed ES = 1, still same result. | 01/01/70 00:00 | |
| How to post source code | 01/01/70 00:00 | |
| few more notes | 01/01/70 00:00 | |
| timing? | 01/01/70 00:00 | |
| Andy, read my post | 01/01/70 00:00 | |
I did! | 01/01/70 00:00 | |
| why are you screwing with the trim? | 01/01/70 00:00 | |
| Thanks everyone its was trim register | 01/01/70 00:00 | |
| Hello, World | 01/01/70 00:00 |