| ??? 07/10/09 08:39 Read: times |
#166978 - Stack Pointer and available RAM |
AT89LP4052
At the start of my program I MOV SP,#7FH I am using RAM locations 30H through 6FH to store data related to the program. I need more RAM, at least 30 locations more to store additional data. How far below 30H and above 6FH do I have available as available RAM where I can store data and read it? I seem to recall SFR's upward to the 2FH range making them unusable as available RAM or am I thinking of a standard 80C31 from the olden days? |
| Topic | Author | Date |
| Stack Pointer and available RAM | 01/01/70 00:00 | |
| "Internal" RAM - basics | 01/01/70 00:00 | |
| some confusion with your links | 01/01/70 00:00 | |
| Follow: can I use 08H through 2FH for general purpose RAM | 01/01/70 00:00 | |
| 08 thru 2F as additional RAM | 01/01/70 00:00 | |
| use the indirect method for upper RAM, take care of Stack | 01/01/70 00:00 | |
| the limits for simple storage | 01/01/70 00:00 | |
| Direct method, Indirect Method or C compiler ? | 01/01/70 00:00 | |
| READ "THE BIBLE" | 01/01/70 00:00 | |
| Tell us which exact 80c51 you are using | 01/01/70 00:00 | |
| Really?? | 01/01/70 00:00 | |
| a long time ago | 01/01/70 00:00 | |
| Another option for usage of Register Banks | 01/01/70 00:00 | |
| instead of getting it piecemeal | 01/01/70 00:00 | |
| I think therefore I ask | 01/01/70 00:00 | |
| WRONG | 01/01/70 00:00 | |
| according to the PDF | 01/01/70 00:00 | |
| Program in Assembler?? | 01/01/70 00:00 | |
assembler only | 01/01/70 00:00 |