uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
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3.4 Operand Address Addressing<br />
48<br />
CHAPTER 3 CPU ARCHITECTURE<br />
The following various methods are available to specify the register and memory (addressing) which undergo<br />
manipulation during instruction execution.<br />
3.4.1 Direct addressing<br />
[Function]<br />
The memory indicated by immediate data in an instruction word is directly addressed.<br />
[Operand format]<br />
Identifier Description<br />
addr16 Label or 16-bit immediate data<br />
[Description example]<br />
MOV A, !FE00H; When setting !addr16 to FE00H<br />
[Illustration]<br />
Instruction code 0 0 1 0 1 0 0 1 OP code<br />
7 0<br />
OP code<br />
addr16 (low)<br />
addr16 (high)<br />
0 0 0 0 0 0 0 0 00H<br />
1 1 1 1 1 1 1 0 FEH<br />
Memory<br />
Preliminary User’s Manual U14938EJ1V0UM