| ??? 04/12/06 15:28 Read: times |
#114166 - In for a penny, in for pound Responding to: ???'s previous message |
OK - the entire circuit has been re-designed to work on 3V, except the custom LCD (which is 5V and can't change without a lot of grief).
I have had an initial stab at studying the December 2005 P89LPC9408 datasheet and there are a few errors and ommissions (should I inform Philips?). The P89LPC9408 is a "two chip" part with an 8K flash 8051 and a PCF8576 LCD driver in one package. Both the P89LPC9408 and the PCF8576 provide for a separate Vlcd (bias voltage for the LCD drive). The P89LPC9408 datasheet does not specifically state the allowable voltage range for Vlcd. It does say that the maximum voltage for "any" pin other than Xtal1 or Xtal2 is +5.5V. If this is true then Vlcd can be the required 5V and I'm home free. I'll ask Philips but if anyone has personal knowledge, please tell me. Besides the errors in the datasheet it appears that the P89LPC9408 is both a derivative and a deviate. Using P1.0 and P1.1 for TxD and RxD and sharing P3.0 and P3.1 with the Xtal connections. Is anyone using this device? Any comments at this point would be welcome before I spend heaps of time -especially regarding Vlcd. Regards, Bert |
| Topic | Author | Date |
| 32x4 segment LCD driver needed | 01/01/70 00:00 | |
| PCF8576 from Philips | 01/01/70 00:00 | |
| advantages of this cyte | 01/01/70 00:00 | |
| it all depends | 01/01/70 00:00 | |
| If you want to take advantage.... | 01/01/70 00:00 | |
| Nice LCD driver | 01/01/70 00:00 | |
| I do not know the details, but have a lo | 01/01/70 00:00 | |
| 32x4 LCD driver | 01/01/70 00:00 | |
| why | 01/01/70 00:00 | |
| Too much work to kick and scream | 01/01/70 00:00 | |
| whimper away, the worry will cease | 01/01/70 00:00 | |
| In for a penny, in for pound | 01/01/70 00:00 | |
| they are, indeed derivatives not deviate | 01/01/70 00:00 | |
Ramtron VMX51C900 | 01/01/70 00:00 |