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| [80] 6522 http://forum.6502.org/viewtopic.php?f=7&t=337 |
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| Author: | Erithros [ Wed Dec 06, 2000 8:09 am ] |
| Post subject: | [80.1] 6522 |
I want to ask anyone who knows : ->Is the timer of 6522 compable of tracking time for purposes likes activating a water pump at a specific time of the day? -->A device which is connected to 6502 through 6522 how it is selected? --->The lines of 6522(PA0-PA7 and PB0-PB7) can each one of them connect with a different device(e.g. a different sensor)? ---->How is the priority handled inside 6522? Thanks p.s:Sorry for my english |
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| Author: | ratboy666 [ Fri Dec 15, 2000 2:00 pm ] |
| Post subject: | [80.2] 6522 |
Yes, the timer can be used for time of day... *BUT* you will need some software... The timer is not time of day, but counts down based on the chip clock. The chip clock will be crystal driven, so will be a reasonably accurate time base (well, at least as good as your digital watch). If you program a particular down count, then when it is finished, you have to adjust the software maintained time of day by the count. As to how to select devices with the '22 - You can latch some of the output bits and use that to select a device (pump, whatever). How you do this depends on the number of pumps (or other) that you want to control. As to priorities - The 6502 has NMI and IRQ. Whatever you wire to the IRQ -- you will have to write software to determine what caused it... Ratboy666 |
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| Author: | GARTHWILSON [ Sat Dec 16, 2000 5:32 am ] |
| Post subject: | [80.3] 6522 |
This discussion has also made its way to "For 6502 -6522" under "General discussion". Garth |
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