GENERAL DESCRIPTION

TM8793 is a One Time PROM embedded high-performance 4-bit microcomputer with LCD/LED driver. It contains all the necessary functions in TM87-series for 1.5V/3V/5V application.

BLOCK DIAGRAM

FEATURE

1.Low power dissipation.

• 1.5V/3V/5V operating voltage range.

2.Powerful instruction set.

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

• 4 bits x 4 bits Multiplier

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

• Various conditional branches.

• 16 initial working registers and manipulators. (can be extended to all RAM by Page Mode)

• Table look-up.

• LCD driver data transfer.

3.ROM  capacity.16Kx  16 bits.

• Instruction ROM Max. capacity16Kx  16 bits.

• Table ROM Max. capacity32512/16256x  8/16 bits.

4.RAM capacity.4K/2K/1Kx  4/8/16 bits.

• STACK Max. capacity16x  16 bits.

• HL/ZR store Max. capacity16/16x  16 bits.

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

6.LCD driver output.

• Over 512 LCD dots by 12 common outputs and 48 segment outputs.

• COM7~12 can be defined as SEG48~43 by option.

• SEG24~47 can be defined as IO, EL, BZ, KI ports by option.

• 1/1~1/12 Duty can be selected by option.

• 1/2 ~1/4 Bias can be selected by option.

• Single instruction to turn off all segments.

• COM5~12 can be defined as CMOS or P_open drain type output by option.

7.Input/output ports.

• Port IOA 4 pins (with internal pull-low, input signal chattering 

• prevention circuitry), and can be defined as SEG24~27/CX, RR, RT, RH by option, or can be defined as CX, RFC0~2 by option.

• Port IOB 4 pins (with internal pull-low), and can be defined as SEG28~31/ELC, ELP. BZB. BZ by option.

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

• Port IOD 4 pins (with internal pull-low, input signal chattering prevention circuitry), and can be defined as SEG36~39 by option.

• Port IOE 4 pins (with internal pull-low), and can be defined as SEG40~43 by option, or can be defined as RFC3~5, CX2 by option.

8.Interrupt function.

• External factors 5 (INT pin, Port IOA, IOC, IOD & KI input).

• Internal factors 5 (Pre-Divider, Timer1, Timer2, Timer3 & RFC).

9.Built-in EL-light driver.

• ELC, ELP. Can be defined as SEG28, 29 by option, or can be defined as SEG44, 45 by option.

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

• BZB, BZ. Can be defined as SEG30, 31 by option, or can be defined as SEG46, 47 by option.

11.Built-in resistance to frequency converter.

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

• CX, RFC0~5, CX2. Can be defined as IOA1~4, IOE1~4 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.Three 6-bit programmable timers with programmable clock source.

• Read out the content in anytime

• Merged 2 or 3 timers as 12-bit or 18-bit timer

• Used as counter for RFC

14.Watchdog timer.

15.Built-in voltage charge halver & pump circuit for Charge Pump type & 1/nVBAT ~ (n-1) /nVBAT (n=3, 4 for 1/3, 1/4Bias) for Capacitive Voltage Divider type

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 3.58 MHz ceramic resonator, internal R or external R type oscillator by option.

17.HALT function.

18.STOP function.