S3F9488 datasheet(39/49 Pages) SAMSUNG

Part #	S3F9488

Description	8-bit CMOS Microcontroller Revision 1

PDF	49 Pages

Scroll/Zoom	100%

Manufacturer	SAMSUNG [Samsung semiconductor]

Direct Link	http://www.samsung.com/Products/Semiconductor

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39 / 49 page

ADDRESSING MODES

S3C9484/C9488/F9488

3-12

INDIRECT ADDRESS MODE (IA)

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.

Figure 3-12. Indirect Addressing

S3F9488 Datasheet(PDF) 39 Page - Samsung semiconductor