Samsung C8278X ユーザーズマニュアル

In Indirect Address (IA) mode, the instruction specifies an address located in the lowest 256 bytes of the program 
memory. The selected pair of memory locations contains the actual address of the next instruction to be executed. 
Only the CALL instruction can use the Indirect Address mode. 

Because the Indirect Address mode assumes that the operand is located in the lowest 256 bytes of program 
memory, only an 8-bit address is supplied in the instruction; the upper bytes of the destination address are 
assumed to be all zeros.  

Current

Instruction

Program Memory
Locations 0-255

Program Memory

OPCODE

dst

Lower Address Byte

Upper Address Byte

Next Instruction

LSB Must be Zero

Sample Instruction:

CALL

#40H

       ;   The 16-bit value in program memory addresses 40H
           and 41H is the subroutine start address.