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This is indicated by two numbers separated by "/". The higher number (on the left side of "/") means duration of instruction when action is taken, the lower number (on the right side of "/") means duration of instruction when action is not taken. All instructions marked by "*" are only alternative opcodes for existing instructions.
This 8080 Microcomputer Systems User's Manual presents all of the. 8080 system components. Over twenty-five devices are described in detail. These new devices further enhance the 8080 system: 8080A - 8-Bit Central Processor Unit. Functionally and Electrically Compatible with the 8080. TTL Drive Capability. Enhanced
WITH THE ABOVE ADDRESSES AND CONDITIONS DEFINED, THE 8080 INSTRUCTIONS. CAN BE DECODED AS SHOWN BELOW. . (3) The INSTRUCTION SET: Normally, a 3—bit OPCODE will give you only 8. But since this machine operates the user cannot access them directly. They are used by the machine
16 Bit Transfer Instructions. 8080 Mnemonic, Z80 Mnemonic, Machine Code, Operation. LXI, B,word, LD, BC,word, 01word, BC <- word. LXI, D,word, LD, DE,word, 11word, DE <- word. LXI, H,word, LD, HL,word, 21word, HL <- word. LXI, SP,word, LD, SP,word, 31word, SP <- word. ---, LD, IX,word, DD21word, IX <- word.
These instructions differ from the 8080 instructions in that each has multiple functions. The SIM instruction sets the interrupt mask and optionally writes one bit of data to the serial interface. The RIM instruction reads one bit from the serial interface (if one is present) and the interrupt mask into register A, the
One way to think about it is that the 8080 and derivatives have a 17-bit address bus rather than the normally cited 16-bit bus. The top bit of that address bus is the chip's input/output request line (IORQ). When you use the normal loads and stores the top bit is always reset. When you perform an in or out the
In addition, there are two 8080 instructions which use either the Band C registers or the D and E registers to address memory. As above, the first register of the pair holds the most significant 8 bits of the address, while the second register holds the least significant 8 bits. These instructions,. STAX and LDAX, are described in
8080 instruction encoding: Conventions in instruction source: D = Destination register (8 bit) S = Source register (8 bit) RP = Register pair (16 bit) # = 8 or 16 bit immediate operand a = 16 bit Memory address p = 8 bit port address ccc = Conditional Conventions in instruction encoding: db = Data byte (8 bit) lb = Low byte of
Due to the regular encoding of the MOV instruction (using a quarter of available opcode space), there are redundant codes to copy a register into itself ( MOV B,B , for instance), which were of little use, except for delays. However, what would have been a copy from the HL-addressed cell into
locating reloc Itable program modules. Hardware Referenc~s. For addition21 information about processors and their related components, refer to the appropriate User's. Manual: 8080 MICROCOMPUTER SYSTEMS USER'S MANU,A,L, 9800153. 8085 MICROCOMPUTER SYSTEMS USER'S MANUAL, 9800366 iv
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