| ??? 10/05/09 15:12 Read: times |
#169440 - Battery-backed microcontroller Responding to: ???'s previous message |
Per Westermark said:
Most microcontrollers draws too much for use with battery-backed RAM since the power will also drive the processor core, I/O pins, ... Because of this, some (haven't seen any 8051-compatible) microcontrollers have a separate supply pin for driving an RTC and battery-backed RAM.. Yes, there are some 8051s that have very low power "sleep" modes. Some (most? all?) achieve this by turning off clocks, peripherals, etc - so the only means of exiting the state is a hard reset. I think, for example, NXP's LPC9xx series has such features? |
| Topic | Author | Date |
| A few questions about internal RAM | 01/01/70 00:00 | |
| questions | 01/01/70 00:00 | |
| through everything | 01/01/70 00:00 | |
| oops | 01/01/70 00:00 | |
| maybe | 01/01/70 00:00 | |
| I'm writing in asm | 01/01/70 00:00 | |
| EEPROM | 01/01/70 00:00 | |
| then RAM is NOT cleared on reset | 01/01/70 00:00 | |
| RE: RAM is NOT cleared on reset. | 01/01/70 00:00 | |
| nothing in the code | 01/01/70 00:00 | |
| RAM indeterminate after a hardware reset | 01/01/70 00:00 | |
| Great | 01/01/70 00:00 | |
| Good checksumming | 01/01/70 00:00 | |
| Please pardon my ignorance | 01/01/70 00:00 | |
| Knowing if initial contents is initialized or not. | 01/01/70 00:00 | |
| Battery-backed microcontroller | 01/01/70 00:00 | |
| Just use an 8051 with eeprom | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| alternatives | 01/01/70 00:00 | |
| Not just "alternative" - but "superior"! | 01/01/70 00:00 | |
| Great suggestions | 01/01/70 00:00 | |
that depends | 01/01/70 00:00 |