GMS34012 データシートの表示（PDF） - Hyundai Micro Electronics

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GMS34012

4-BIT SINGLE CHIP MICROCOMPUTERS

Hyundai Micro Electronics 

Chapter 2. Architecture

Y-register (Y)

Y-register has 4 bits. It operates as a data pointer or a general-purpose register.

Y-register specifies and address (a0~a3) in a page of data memory, as well as it

is used to specify an output port. Further it is used to specify a mode of carrier

signal outputted from the REMOUT port. It can also be treated as a general-

purpose register on a program.

Accumulator (ACC)

The 4-bit register for holding data and calculation results.

Arithmetic and Logic Unit (ALU)

In this unit, 4bits of adder/comparator are connected in parallel as it`s main

components and they are combined with status latch and status logic (flag.)

(1) Operation circuit (ALU) :

The adder/comparator serves fundamentally for full addition and data

comparison. It executes subtraction by making a complement by processing

an inversed output of ACC (ACC+1)

(2) Status logic :

This is to bring an ST, or flag to control the flow of a program. It occurs when

a specified instruction is executed in two cases such as overflow in operation

and two inputs unequal.

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