| ??? 07/17/07 08:42 Read: times |
#141951 - how does it function as reset? Responding to: ???'s previous message |
I don't know if this applies in your case, but the datasheet states:
LPC90x datasheet said:
Remark: During a power-up sequence, the RPE selection is overridden and this pin will always function as a reset input. An external circuit connected to this pin should not hold this pin LOW during a power-on sequence as this will keep the
device in reset. After power-up this input will function either as an external reset input or as a digital input as defined by the RPE bit. Only a power-up reset will temporarily override the selection defined by RPE bit. Other sources of reset will not override the RPE bit. Anyway, given the many-times-reported trouble with internal powerup reset (the need to get VCC below 0.2V to make it work reliably), I would not resort to internal reset of LPC9xx-s unless there is the needed control over VCC - or it is a device where the functionality does not need to be ensured 100% of the time and occasional extra power cycle forced by user is tolerable. JW |
| Topic | Author | Date |
| Using RST as Input on 89LPC901 | 01/01/70 00:00 | |
| how does it function as reset? | 01/01/70 00:00 | |
| how does it function as reset? | 01/01/70 00:00 | |
| isn't it something else? | 01/01/70 00:00 | |
Using RST as Input on 89LPC901 | 01/01/70 00:00 |