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tenx MCU
> 4-bit MCU
> TM89 series
>MCU
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| TM8955 |
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4-Bit Micro-Controller
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TM8955 Data Sheet (Ver 1.0) (*.pdf)
tenx 4-bit Summary (*.pdf)
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Description:
The TM8955 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 crcuitry in a signal chip.
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Feature:
1. Lowe power dissipation
- 1.5V / 3V operation voltage range.
2. Power instruction set.
- Binary addition, subtraction, BCD. BCD can be executed directly in addition, subtraction.
- 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 : 16K x 16 bits.
- Instruction ROM Max. Capacity : 16K x 16 bits.
- Table ROM Max. Capacity : 24K / 12K x 8 / 16 bits.
4. RAM Capacity : 4K / 2K / 1K x 4 / 8 / 16 bits.
- LCD Max. Capacity : 256 / 128 / 64 x 4 / 8 / 16 bits.
- STACK Max. Capacity : 16 x 16 bits.
- HL/ZR store Max. Capacity : 16 / 16 x 16 bits.
5. With direct / index addressing mode in data RAM access.
6. LCD driver output.
- COM12~16 can be defined as SEG64~61 by mask option.
- SEG41~61 can be defined as IOB1~4, KI1~4, ELC, ELP, BZB, BZ, IOD1~4, IOC1~4 by mask option
- 1/4 ~ 1/16 Duty can be selected by mask option.
- 1/3 ~ 1/5 Bias can be selected by mask option.
- Single instruction to turn off all segments.
- COM5 ~ 16 can be defined as COMS or P_open drain type output by mask option.
- External regulator mode for VL1/2 by mask option.
7. Input / output ports.
- Port IOA : 4 pins (with internal pull-low, input signal chattering prevention circuitry), and can be defined as CX, RFC0~2 by mask option.
- Port IOB : 4 pins (with internal pull-low), and can be defined as SEG41 ~ 44 by mask option.
- Port IOC : 4 pins (with internal pull-low, low-level-hold, input signal chattering prevention circuitry), and can be defined as SEG57 ~ 60 by mask option.
- Port IOD : 4 pins (with internal pull-low, input signal chattering prevention circuitry), and can be defined as SEG53 ~ 56 by mask option.
- Port IOE : 4 pins (with internal pull-low), and can be defined as RFC3~5, CX2 by mask option.
8. Interrupt function
- External factors 5 (INT pin, Port IOA, IOC, IOD and KI input).
- Internal factors 5 (Pre-Divider, Timer 1, Timer 2, Timer 3 and RFC).
9. Built-in EL-light driver.
- ELC, ELP. Can be defined as SEG51 and SEG52 by mask option.
10. Built-in Alarm, clock or single tone melody generator.
- BZB, BZ. Can be defined as SEG51 and SEG52 by mask option.
11. Built-in resistance to frequency converter.
- CX, CX2, RFC0~5. Can be defined as IOA1~4 and IOE1~4 by mask option.
12. Built-in key matrix scanning function.
- KO1 ~ KO16 (Shared with SEG1 ~ 16)
- KI1 ~ KI4 (Can be defined as SEG45 ~ 48 by mask option)
13. Three 6-bit programmable timer 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 and pump circuit.
16. Dual clock operation
- Slow clock oscillation can be defined as X'tal or external RC type oscillator by mask option.
- Fast clock oscillation can be defined as 3.58MHz ceramic resonator, internal R or external R type oscillator by mask option.
17. HALT function.
18. STOP function.
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Applications:
- Timer / Calendar / Calculator / Thermometer
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