EU1020 datasheet(3/21 Pages) EOREX

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eorex

EU1020

Feb.2009

www.eorex.com

MCU Description

Item

Abbreviation

Description

Accumulator

ACC

The EU1020 has an 8-bit register used for data hold,

exchange, arithmetic, transfer and I/O operation.

Index Register

(X,Y)

In EU101x that builds in two index registers ( X and Y ).

These two index registers could be used to count program

steps or to provide an index value to be used in generating as

effective address.

When executing an instruction which specifies indexed

addressing, the MCU fetches the operation code and the

base address, and modifies the address by adding the index

post-index of indirect address is possible.

Special Function

SFR

The EU102x includes some special function control registers

in zero-page. For more detailed information about the special

function registers, please refer to next section.

Stack pointer

The stack pointer is an 8-bit register that is used to control

the addressing of the variable-length stack. The stack pointer

is automatically incremented and decremented under control

of the microprocessor the perform stack manipulations under

direction of either the program or interrupts. The stack allows

a simple implementation of nested subroutines and multiple

level interrupts. The stack pointer is initialized by the user’s

software.

Program counter

The 14-bit program counter register provides the address

that step the microprocessor through sequential program

instructions.

Program Flag

The 8-bit status flag register contains seven status flags.

Some of the flags are controlled by the program and others

may be controlled both by the program and the MCU.

Instruction set contains a number of conditional branch

instructions that are designed to allow testing of these flags.

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