ADAM27P16 datasheet(16/39 Pages) ABOV

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2.6. Accumulator (ACC)

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

2.7. 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.)

2.7.1. 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)

2.7.2. 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 three cases such as overflow or underflow

in operation and two inputs unequal.

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

Y-register specifies an 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 ROUT port. It can also be treated as a general-

purpose register on a program.

2.5. Y-register (Y)

2.8. Clock Generator

ADAM27PXX has an internal RC oscillator that supports a frequency of 3.64MHz only.

The oscillator circuit is designed to operate without an external ceramic resonator.

The Internal Oscillator is calibrated using the Rom-writer. In STOP mode, the internal

oscillator stops.

ADAM27PXX

2. Architecture

ADAM27P16 数据表(PDF) 16 Page - ABOV Semiconductor Co., Ltd.