| ??? 06/13/11 13:51 Read: times |
#182635 - missed CJNE Responding to: ???'s previous message |
1. SP=7, I knew this
2. ACC=0, I didn't know this 3. Registers have no default, I assumed this (is that a bad assumption?) 4. CJNE also changes the carry, it is often used by SDCC 5. DJNZ ACC,somewhere, yup 6. Division by zero, I did not 'know' this 7. Byte overflow, I didn't 'know' this either 8. I don't know or care about BCD 9. -128/+127 from the next instruction, I knew this 10. AJMP/ACALL is only relevant on 2kB limited devices IMHO, otherwise they just use up expensive instructions 11. Memory access overwrite P0, I definitely did not know this 12. Are ALE pulses only skipped for MOVX or also for long instructions? Maarten |
| Topic | Author | Date |
| 8051 core quiz | 01/01/70 00:00 | |
| quizes are out of fashion these days... | 01/01/70 00:00 | |
| I did it.... | 01/01/70 00:00 | |
| thanks | 01/01/70 00:00 | |
| missed CJNE | 01/01/70 00:00 | |
| indeed | 01/01/70 00:00 | |
| I guess a quite frequent oversight | 01/01/70 00:00 | |
| RE: optimize LJMPs to AJMPs, etc | 01/01/70 00:00 | |
| Maybe? | 01/01/70 00:00 | |
| caught again! | 01/01/70 00:00 | |
| Most common 8051 assembly mistake? | 01/01/70 00:00 | |
| Not just 8051? | 01/01/70 00:00 | |
| Different assemblers have different probabilities | 01/01/70 00:00 | |
| Conceptual & Typographical errors | 01/01/70 00:00 | |
| some assemblers do | 01/01/70 00:00 | |
| Readability helps | 01/01/70 00:00 | |
99's | 01/01/70 00:00 |