| ??? 09/04/13 21:52 Read: times |
#190013 - Divider Responding to: ???'s previous message |
Jim Granville said:
If you reload the Clock Divider on some pin change, or serial command, does that restore the expected operation ? The divider is not set. You select the operating frequency during programming, and you can then divide the programmed frequency using the divider - that's how it should be at least. It seems to run at about 1.5MHz when I set the CLK_DIV register to 1, and not the programmed clock/2. Alpha/beta silicon? The STC info suggests they defaulted to No-divide, which is not so clever on a slowly rising supply - the RST may release <before> the CPU can run at 35MHz. It should run at 5MHz or whatever you set - not 35MHz. It looks like they use a µpot or similar as the R of the RC oscillator. The µpot is then set during programming. What voltage does it release RST at ? 3.8 or 4.1V. It should run correctly at either voltage. The LP52 looks quite good here, because it is such a low speed, it seems to always be OK, even close to the 2.0V BOD level. I like the LP52 also, but the frequency is just a bit low. The timing accuracy is better with the STC - when they run at the right speed ;) Mikkel |
| Topic | Author | Date |
| STC 15F104E | 01/01/70 00:00 | |
| The STC12C5Axxx work fine | 01/01/70 00:00 | |
| Others | 01/01/70 00:00 | |
| Support from STC? | 01/01/70 00:00 | |
| Support? | 01/01/70 00:00 | |
| Just Email STC | 01/01/70 00:00 | |
| Who am I e-mailing? | 01/01/70 00:00 | |
| I guess SiliconRay is same as STC | 01/01/70 00:00 | |
| RST and Full speed ? | 01/01/70 00:00 | |
| Divider | 01/01/70 00:00 | |
LP52 | 01/01/70 00:00 | |
| USB programming works | 01/01/70 00:00 |