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TM8720

Data Sheet
DS-TM8720_EV16.pdf

11/21/2022
User manual
UM-TM8720_EV14.pdf

11/21/2022
UM-4BIT Series Difference List_EV10.pdf

3/29/2021
UM-4BITMCUfunction_CV10.pdf

3/29/2021
UM-4BITinstructions_CV10.pdf

3/29/2021

Development Tools
TICE89
TWR98/TWR99/TWR100/TWR100A

GENERAL DESCRIPTION
The TM8720 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 and LCD driver in a single chip.
BLOCK DIAGRAM


FEATURES
1.	1.5V operation only and with low power dissipation.
2.	Powerful instruction set (86 instructions)
	Binary addition, subtraction, BCD adjustment, logical operation in direct.
	Single-bit manipulation (set, reset, decision for branch).
	Various conditional branches.
	16 working registers and manipulation.
	LCD driver data transfer. 
3.	Memory capacity
	ROM capacity	1024	x 16 bits.
	RAM capacity	64	x   4 bits.
4.	Input/output ports
	Port IOA         4 pins (with internal pull-low), IOA port has built-in the input signal chattering prevention circuitry.
	Port IOB2, 3, 4    3 pins (with internal pull-low), & mask option with BZB, BZ.
5.	4-level subroutine nesting.
6.	Interrupt function
	One external factor (Pin IOA port).
	Two internal factors (Pre-Divider, Timer2).
7.	Built-in Alarm, clock or single tone melody generator (BZB, BZ), & mask option with IOB3, 4.
8.	One 6-bit programmable timer (Timer 2) with programmable clock source.
9.	LCD driver output
	12 LCD driver outputs (up to drive 48 LCD segments).
	1/4 Duty and 1/2 Bias for LCD display.
	Single instruction to turn off all segments.
	12 LCD Address
10.	Built-in Voltage double charge pump circuit.
11.	Clock oscillation can be defined as X’tal, external-R or internal-R 2 type oscillators by mask option.
12.	HALT function.
13.	STOP function.
APPLICATION
Thermometer


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