GENERAL DESCRIPTION

The TM87ML22(H/L) is a Multiple Time Programmed ROM 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.

BLOCK DIAGRAM

FEATURE

1.Low power dissipation.

• 1.5V/3V operating voltage range.

TM87ML22L1.5V Power Mode

TM87ML22H3V Power Mode

2.Powerful instruction set.

• Binary addition, subtraction, BCD. BCD can be executed directly in addition, subtraction.

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

• Various conditional branches.

• 16 initial working registers and manipulators.

• Table look-up.

• LCD driver data transfer.

3.ROM(MTP) capacity.2Kx 16 bits.

• Instruction ROM Max. capacity2Kx 16 bits.

• Table ROM Max. capacity3840x 8 bits.

• Endurance: 1000 cycles (min.)

4.RAM capacity.128x 4bits.

5.With direct/index addressing mode in data RAM access.

6.LCD driver output.

• Max 175 LCD dots by 5 common outputs and 35 segment outputs.

• SEG24~35 can be defined as IOA1~4/CX, RR, RT, RH, IOB1~4/ELC, ELP, BZB, BZ,

IOC/KI1~4 by option.

• 1/1~1/5 Duty can be selected by option.

• 1/2 ~1/3 Bias can be selected by option.

• Single instruction to turn off all segments.

• COM1~5, SEG1~35 can be defined as CMOS or P_open drain type output by option(COM1 & SEG35  force same  PSTB & DBUS option for CMOS or P_open drain type output).

• Built-in regulator mode for VL1/2 by option.

7.Input/output ports.

• Port IOA4 pins (with internal pull-low), and can be defined as SEG24~27/CX,RR,RT,RH by option.

• Port IOB4 pins (with internal pull-low), and can be defined as SEG28~31/ELC, ELP, BZB, BZ by option.

• Port IOC4 pins (with internal pull-low, low-level-hold, input signal chattering prevention circuitry), and can be defined as SEG32~35/KI1~4 by option.

8.Interrupt function.

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

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

9.Built-in EL-light driver.

• ELC, ELP. Can be defined as SEG28, 29/IOB1, 2 by option.

10.Built-in Alarm, clock or single tone melody generator.

• BZB, BZ. Can be defined as SEG30, 31/IOB3, 4 by option.

11.Built-in resistance to frequency converter.

• CX, RR, RT, RH. Can be defined as SEG24~27/IOA1~4 by option.

12.Built-in key matrix scanning function.

• KO1~KO16 (Shared with SEG1~16)

• KI1~KI4. Can be defined as SEG32~35/IOC1~4 by option.

13.Two 6-bit programmable timers with programmable clock source.

• Read out the content in anytime

14.Watchdog timer.

15.Built-in voltage charge halver & pump circuit.

16.Dual clock operation

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

• fast clock oscillation can be defined as internal R or external R(Fast Only) type oscillator by option.

17.HALT function.

18.STOP function.

19.Built-in Low Battery Detect.

20.Built-in Low Voltage Reset.