| ??? 02/16/09 08:07 Read: times |
#162462 - Think about it Responding to: ???'s previous message |
Each instruction takes a finite time to execute; those times are specified in the Instruction Set manual - part of the so-called "bible" for the 8051 - so it is simply a matter of adding-up the times between each instruction that affects the port pin!
Here are the links to the so-called "bible" for the 8051: Chapter 1 - 80C51 Family Architecture: http://www.nxp.com/acrobat_d...ARCH_1.pdf Chapter 2 - 80C51 Family Programmer's Guide and Instruction Set: http://www.nxp.com/acrobat_d...UIDE_1.pdf Chapter 3 - 80C51 Family Hardware Description: http://www.nxp.com/acrobat_d...WARE_1.pdf Note that these apply to the "classic" 8051 architecture - check the specific documentation for your particular chip for any variations Jan Waclawek also has some timing information on his User Page: http://www.8052.com/users/wek/ Murali Krishna said:
Can I measure pulse width using SoftDSP oscilloscope? I have no idea - what do its specifications say? If yes, how to configure SOft DSP? (I have SoftDSP200) If you have the product, then you must surely also have the User Instructions - what do they tell you? |
| Topic | Author | Date |
| what is the signal freuency on all ports of at89c52/51 | 01/01/70 00:00 | |
| minimum pule is 1086 nanoseconds. | 01/01/70 00:00 | |
| Buzz! | 01/01/70 00:00 | |
| 40ns is a very short time | 01/01/70 00:00 | |
| You need a faster MCU | 01/01/70 00:00 | |
| the fastest '51 | 01/01/70 00:00 | |
| 80ns ? | 01/01/70 00:00 | |
| Sorry about that ... | 01/01/70 00:00 | |
| Still not known if single pulse or pulse train | 01/01/70 00:00 | |
| Where there's a will ... | 01/01/70 00:00 | |
| Timer or PCA | 01/01/70 00:00 | |
| repeat earlier question with clarity | 01/01/70 00:00 | |
| Timing can't be discussed when C is involved | 01/01/70 00:00 | |
| Think about it | 01/01/70 00:00 | |
| Supplementary question... | 01/01/70 00:00 | |
At first blush . . . | 01/01/70 00:00 |