tenx technology

TM8704

4 Bit Microcontroller

tenx technology, inc.

Ver 1.0

03/12/01

GENERAL DESCRIPTION

The TM8704 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, LCD driver and look-up table in a

signal chip.

FEATURE

1.

1.5V operation only and with low power dissipation.

2.

Powerful instruction set (129 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

1152

x 16 bits.

RAM capacity

80

x 4 bits.

4.

LCD driver output.

5 common outputs and 24 segment outputs (up to drive 120 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 output pins (SEG1~12) could be defined as CMOS or P_open drain output

type by mask option.

5.

Input/output ports.

Port IOA

4 pins, muxed with SEG24~SEG27.

Port IOB

4 pins(with internal pull-low), muxed with SEG28~SEG31.

Port IOC

4 pins(with internal pull-low), muxed with SEG32~SEG35.

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

6.

8 level subroutine nesting.

7.

Interrupt function.

External factor 2

(INT pin, Port IOC).

Internal factors 2

(Pre-Divider, Timer1).

8.

Built-in Diode for Solar Cell power regulation.

9.

Built in Alarm generator.