4 operand address addressing, 1 direct addressing – NEC switch User Manual
Page 51
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CHAPTER 3 CPU ARCHITECTURE
User’s Manual U12978EJ3V0UD
51
3.4 Operand Address Addressing
The following methods are available to specify the register and memory (addressing) to undergo manipulation
during instruction execution.
3.4.1 Direct addressing
[Function]
The memory indicated by immediate data in an instruction word is directly addressed.
[Operand format]
Identifier
Description
addr16
Label or 16-bit immediate data
[Description example]
MOV A, !FE00H; When setting !addr16 to FE00H
Instruction code
0
0
1
0
1
0
0
1
Opcode
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
0
00H
FEH
[Illustration]
7
0
Opcode
addr16 (Low)
addr16 (High)
Memory
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