TM8720 FEATURES 1. 1.5V operation only and with low power dissipation. 2. Powerful instruction set ( 86 instructions) * Binary addition, subtraction, BCD adjust, logical operation in direct. * Single-bit manipulation (set, reset, decision for branch). * Various conditional branch. * 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 had built in the input ** 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 * External factor 1 (Pin IOA port). * Internal factors 2 (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 and1/2 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 oscillator by mask option. 12. HALT function. 13. STOP function.