![]() We haven't had an opportunity to verify or disprove this report, so we present it to the world as "additional information. machine cyclelnumber of clock cycles used to perform one instructionlvaries with instructionlusually the lowest is quoted as the machine cyclelfor 8051, 12 clock cycles are minimum needed perinstructionltime per machine cycletmc clocks per machine cycle / clock frequencyfor 8051 clocked at 11.0592mhz,ltmc 12 / 11.0592m 1. In this case, it would be a three-byte instruction. Note: We received input from an user that the undefined instruction really has a format of Undefined bit1,bit2 and effectively copies the value of bit2 to bit1. However, based on my research, executing this undefined instruction takes 1 machine cycle and appears to have no effect on the system except that the Carry Bit always seems to be set. Since it is not documented nor defined it is not recommended that it be executed. The 8051 supports 255 instructions and OpCode 0xA5 is the single OpCode that is not used by any documented function. ![]() ![]() Scribd is the world's largest social reading and publishing site. Description: The "Undefined" instruction is, as the name suggests, not a documented instruction. 8051 Opcode Sheet - Free download as PDF File (.pdf), Text File (.txt) or read online for free.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |