| ??? 06/29/06 14:39 Read: times |
#119339 - Z80? Responding to: ???'s previous message |
If I understood your question right, the Z80 has a quite extensive instruction set, both in terms of different instructions and in terms of different opcodes (I mean, the first: mov a,r6 and mov a,r7 is one instruction with 2 different parameters; the second: mov a,r6=0xEE, mov a,r7=0xEF -> 2 different opcodes).
http://en.wikipedia.org/wiki/Zilog_Z80#Instruction_set_and_encoding said:
The Z80 uses 252 out of the available 256 codes as single byte opcodes; the four remaining codes are used extensively as opcode prefixes; CB and ED enables extra instructions and DD or FD selects IX+d or IY+d (in place of HL). This scheme gives the Z80 a large number of permutations of instructions and registers; Zilog categorizes these into 158 different "instruction types", 78 of which are the same as those of the Intel 8080 (allowed operation of 8080 programs on a Z80). JW |
| Topic | Author | Date |
| Number Of Instruction Set. | 01/01/70 00:00 | |
| two ways to look at it | 01/01/70 00:00 | |
| Z80? | 01/01/70 00:00 | |
| Motorola 6809 | 01/01/70 00:00 | |
| What's so bad about the HC11? | 01/01/70 00:00 | |
| What's so bad about the HC11? | 01/01/70 00:00 | |
| Do you believe every advert? | 01/01/70 00:00 | |
| Great links! | 01/01/70 00:00 | |
| Instruction Set | 01/01/70 00:00 | |
| Not always one | 01/01/70 00:00 | |
| not a micro, but | 01/01/70 00:00 | |
| Does size matter? | 01/01/70 00:00 | |
| I've got a little chore ... proofreading | 01/01/70 00:00 | |
| not a taker.. | 01/01/70 00:00 | |
| I'm starting with something similar | 01/01/70 00:00 | |
| 01/01/70 00:00 | ||
| Proofreading | 01/01/70 00:00 | |
| Richard send me that EXCEL file. | 01/01/70 00:00 | |
| looks like it will be done on Saturday | 01/01/70 00:00 | |
| It didn't work out that way | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
Did you receive the EXCEL file as well? | 01/01/70 00:00 |