GENERAL DESCRIPTION

The TM8762 is an embedded high-performance 4-bit microcomputer with LCD/LED 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.

BLOCK DIAGRAM

FEATURE

1.Low power dissipation.

2.Powerful instruction set (143 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 capacity2048 x 16 bits.

• RAM capacity128 x 4 bits.

4.LCD/LED driver output.

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

• 1/2 Duty, 1/3 Duty, 1/4 Duty or 1/5 Duty for both LCD/LED drivers is selected by mask option.

• 1/2 Bias or 1/3 Bias for LCD driver is selected by mask option.

• Single instruction to turn off all segments.

• All segment outputs could be defined as CMOS or P_open drain output type by mask option.

5.Input/output ports.

• Port IOA4 pins (with internal pull-low), muxed with SEG24~27.

• Port IOB4 pins (with internal pull-low), muxed with SEG28~31.

• Port IOC4 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 factors3(INT pin, Port IOC & KI input).

• Internal factors4(Pre-Divider, Timer1, Timer2 & RFC).

8.Built-in EL panel driver.

• ELC, ELP (Muxed with SEG28, SEG29).

9.Built in Alarm, clock or single tone melody generator.

• BZB, BZ (Muxed with SEG30, SEG31).

10.Built-in R to F Converter circuit.

• CX, RR, RT, RH (Muxed with SEG24~SEG27).

11.Built in key matrix scanning function.

• K1~K16 (Shared with SEG1~SEG16).

• KI1~KI4 (Muxed with SEG32~SEG35).

12.Two 6-bit programmable timer with programmable clock source.

13.Watch dog timer.

14.Built-in Voltage doubler, halver, tripler charge pump circuit.

15.Dual clock operation

• slow clock oscillation can be defined as X’tal or external RC type oscillator by mask option.

• fast clock oscillation can be defined as internal R or external R type oscillator by mask option. 

16.HALT function.

17.STOP function.