| ??? 11/17/05 09:51 Read: times |
#103846 - Implicit/Explicit Responding to: ???'s previous message |
Slobodan Mandaric said:
If you try to write INC A and INC ACC, the first will be assembled as 04, the second as 05 E0 ! The INC A instruction is "Increment Accumulator", it has no operand - the affected object (A) is implicit in the instruction. Perhaps it would've been better if they'd called it "INCA" rather than "INC A"? Then it might've been more obvious that the 'A' is not an operand in the usual sense. The INC <direct> instruction increments the directly-addressed memory location specified by its "<direct>" operand. The "<direct>" operand could specify the address of the Accumulator - normally given the symbolic name "ACC" The INC Rn instruction increments the Register specified by its "Rn" operand. See Chapter 2 of the "bible": Chapter 2 - 80C51 Family Programmer's Guide and Instruction Set: http://www.semiconductors.philips.com/acrobat/v...UIDE_1.pdf |
| Topic | Author | Date |
| Increment Function | 01/01/70 00:00 | |
| ACC is a direct register | 01/01/70 00:00 | |
| Implicit/Explicit | 01/01/70 00:00 | |
| gain? | 01/01/70 00:00 | |
| single clocker | 01/01/70 00:00 | |
| wiki | 01/01/70 00:00 | |
The A/ACC and B registers are located in | 01/01/70 00:00 |