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CSA3.84MG

4-BIT SINGLE CHIP MICROCOMPUTERS

Hynix Semiconductor 

CHAPTER 3. Instruction

Chapter 3. Instruction

INSTRUCTION FORMAT

All of the 43 instruction in GMS340 series is format in two fields of OP code and

operand which consist of eight bits. The following formats are available with

different types of operands.

Format¥°

All eight bits are for OP code without operand.

Format¥±

Two bits are for operand and six bits for OP code.

Two bits of operand are used for specifying bits of RAM and X-register (bit 1 and

bit 7 are fixed at ¡È0¡È)

Format¥²

Four bits are for operand and the others are OP code.

Four bits of operand are used for specifying a constant loaded in RAM or Y-

register, a comparison value of compare command, or page addressing in ROM.

Format ¥³

Six bits are for operand and the others are OP code.

Six bits of operand are used for word addressing in the ROM.

3- 1

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