4 Bit Microcontroller
The TM8726 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, Resistance to Frequency
Converter(RFC), EL panel driver, LCD driver, look-up table, watchdog timer and key matrix
scanning circuitry in a signal chip.
1. Low power dissipation.
2. Powerful instruction set (178 instructions).
zBinary addition, subtraction, BCD adjust, logical operation in direct and index
zSingle-bit manipulation (set, reset, decision for branch).
zVarious conditional branch.
z16 working registers and manipulation.
zLCD driver data transfer.
3. Memory capacity.
4096 x 16 bits.
512 x 4 bits.
4. LCD driver output.
z9 common outputs and 41 segment outputs (up to drive 369 LCD segments).
z1/2 Duty, 1/3 Duty, 1/4 Duty, 1/5 Duty, 1/6Duty, 1/7Duty, 1/8Duty or 1/9Duty is selected
by MASK option.
z1/2 Bias, 1/3 Bias or 1/4 Bias is selected by MASK option.
zSingle instruction to turn off all segments.
zCOM5~9,SEG1~41 could be defined as CMOS or P_open drain type output by mask
5. Input/output ports.
4 pins (with internal pull-low), muxed with SEG24~SEG27.
4 pins (with internal pull-low). muxed with SEG28~SEG31
4 pins (with internal pull-low, low-level-hold), muxed with SEG32 ~
IOC port had built in the input signal chattering prevention circuitry.
4 pins (with internal pull-low), muxed with SEG36 ~ SEG39. IOD
port had built in the input signal chattering prevention circuitry.
6. 8 level subroutine nesting.
7. Interrupt function.
zExternal factors 4
zInternal factors 4
(INT pin, Port IOC, IOD & KI input).
(Pre-Divider, Timer1, Timer2 & RFC).
1 tenx technology, inc.