| ??? 03/25/05 04:23 Read: times |
#90393 - Yes and no Responding to: ???'s previous message |
Alberto Geraci said:
No...Craig, page 10 of datasheet said that A1IE and A2IE are disabled (logic 0) when power is first aplied. You are right. Still doesn't help me, though, since it still sets A1F and A2F regardless. In my opinion, that is the problem, or your "error"....... why not to determine if the alarm has ocurred, reading the INTA/INTB output/s, I think, that the DS1337 was designed to disable the alarms by this way, unless you want to determine if an alarm has ocurred while your system was in "power off"...but this has no sense at all, so I insist...am I understanding your point ? or you're trying to do some incorrect use of chip. That's exactly my case. My MCU will be in idle mode and the RTC interrupt will wake it up when an alarm occurs. I will then read the status register to determine which alarm woke up the system and proceed accordingly. If an alarm is triggered when I actually want to have alarms disabled, the unit will wake up unnecessarily and, more importantly, I'll have to code for the fact that I have "phantom" alarms. It'd be easier if I could just disable them. Again, I seem to be able to accomplish this by setting the "Alarm 1 Date" register to 0x39 which is an impossible date. I just wish there were a cleaner way to accomplish what I need to accomplish without setting the alarm to an invalid value. Regards, Craig Steiner |
| Topic | Author | Date |
| Disabling DS1337 alarm | 01/01/70 00:00 | |
| DS1337 alarms | 01/01/70 00:00 | |
| Disabling DS1337 alarm | 01/01/70 00:00 | |
| Disabling the alarms | 01/01/70 00:00 | |
| Disabling DS1337 alarm | 01/01/70 00:00 | |
Yes and no | 01/01/70 00:00 | |
| Stopping Alarms | 01/01/70 00:00 | |
| Forget that | 01/01/70 00:00 | |
| Yes it is confusing | 01/01/70 00:00 |