TM6820 datasheet, PDF - EEWORLD Datasheet

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TM6820: Description4 Bit Microcontroller; File Size94KB，9 Pages; ManufacturerETC

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TM6820 Overview

4 Bit Microcontroller

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TM6820

tenx technology

GENERAL DESCRIPTION

The TM6820 is an embedded high-performance 4-bit microcomputer with LCD driver. It

contains all the necessary functions, such as 4-bit parallel processing ALU, ROM, RAM,

I/O ports, timer, clock generator, dual clock operation, Resistance to Frequency

Converter(RFC), EL panel driver, LCD driver, look-up table, watchdog timer and key matrix

scanning circuitry in a signal chip.

FEATURE

1. Low power dissipation.

2. Powerful instruction set (142 instructions).

Binary addition, subtraction, BCD adjust, logical operation in direct and index

addressing mode.

Single-bit manipulation (set, reset, decision for branch).

Various conditional branch.

16 working registers and manipulation.

Table look-up.

LCD driver data transfer.

3. Memory capacity.

ROM capacity

RAM capacity

2048

128

x 16 bits.

x 4 bits.

4 Bit Microcontroller

4. LCD driver output.

5 common outputs and 35 segment outputs (up to drive 175 LCD segments).

1/2 Duty, 1/3 Duty, 1/4 Duty or 1/5 Duty is selected by mask option.

1/2 Bias or 1/3 Bias is selected by mask option.

Single instruction to turn off all segments.

Segment outputs(SEG1~35) could be defined as CMOS or P_open drain output

type by mask option.

5. Input/output ports.

Port IOA

4 pins (with internal pull-low), muxed with SEG24~27.

Port IOB

4 pins (with internal pull-low), muxed with SEG28~31.

Port IOC

4 pins (with internal pull-low/low-level-hold), muxed with SEG32~35.

IOC port had built in the input signal chattering prevention circuitry.

6. 8 level subroutine nesting.

7. Interrupt function.

External factor 2

Internal factor 4

(INT pin, Port IOC).

(Pre-Divider, Timer1, Timer2 & RFC).

8. Built-in EL panel driver.

ELC, ELP (Muxed with SEG28, SEG29).

tenx technology, inc.

V1.4

10/08/01

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