tenx technology
TM8705
4 Bit Microcontroller
1
tenx technology, inc.
Rev 1.3
03/12/01
GENERAL DESCRIPTION
The TM8705 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.
FEATURE
1.
Low power dissipation.
2.
Powerful instruction set (178 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 capacity
3072
x 16 bits.
RAM capacity
384
x 4 bits.
4.
LCD driver output.
6 common outputs and 40 segment outputs (up to drive 240 LCD segments).
1/2 Duty, 1/3 Duty, 1/4 Duty,1/5 Duty or 1/6Duty is selected by MASK option.
1/2 Bias or 1/3 Bias is selected by MASK option.
Single instruction to turn off all segments.
COM5~6,SEG1~40 could be defined as CMOS or P_open drain type output by
mask option.
5.
Input/output ports.
Port IOA
4 pins (with internal pull-low), muxed with SEG24~SEG27.
Port IOB
4 pins (with internal pull-low). muxed with SEG28~SEG31
Port IOC
4 pins (with internal pull-low, low-level-hold), muxed with SEG32 ~
SEG35.
IOC port had built in the input signal chattering prevention circuitry.
Port IOD
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.
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