| ??? 09/15/05 13:32 Read: times |
#101128 - re: 2 Hints! Responding to: ???'s previous message |
hi,
Reza Javan said:
Hello Oleg MOV A,P1 ; load current state of bits 0...3 .. .. XRL P1,A ; change not masked bitsIs there any need to mov p1,#0ffh before first line? No, probably not. Reading port into Acc returns value from pins of port. It does not depend on how pins are configured - as input or output ones. Before it i thought in mathematical operation,first operand must only be accumlator!
Yes, the arithmetic operations have this limitation. Here we use logical operation which is free from this rule. Regards, Oleg |
| Topic | Author | Date |
| Week puzzle IV | 01/01/70 00:00 | |
| In my opinion | 01/01/70 00:00 | |
| no | 01/01/70 00:00 | |
| Bufff!! then TRB | 01/01/70 00:00 | |
| Me and my shadow, walking down the aven | 01/01/70 00:00 | |
| You & your shadow | 01/01/70 00:00 | |
| http://www.coleporter.org/ | 01/01/70 00:00 | |
| it's a hint | 01/01/70 00:00 | |
| Well | 01/01/70 00:00 | |
| you got it | 01/01/70 00:00 | |
| Just OR with ones | 01/01/70 00:00 | |
| how? | 01/01/70 00:00 | |
| a simple solution: | 01/01/70 00:00 | |
| not atomic | 01/01/70 00:00 | |
atomic not possible in general ! | 01/01/70 00:00 | |
| My solution! | 01/01/70 00:00 | |
| Wrong | 01/01/70 00:00 | |
| not atomic | 01/01/70 00:00 | |
| Ok, here is the shadow | 01/01/70 00:00 | |
| only four bits | 01/01/70 00:00 | |
| 2 Hints! | 01/01/70 00:00 | |
| Oh boy, do you need some bible time | 01/01/70 00:00 | |
| re: 2 Hints! | 01/01/70 00:00 |