TM8951
GENERAL DESCRIPTION
The TM8951 is an embedded high-performance 4-bit microcontroller 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 etc. on a signal chip.
BLOCK DIAGRAM
FEATURES
1. Low power dissipation.
1.5V/3V operating voltage range.
2. Powerful instruction set.
Binary addition, subtraction, BCD adjustment. BCD can be performed directly in addition/ subtraction operations.
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 with Page Mode)
Look-up Table.
LCD driver data transfer.
3. ROM Capacity. 8K x16 bits.
Instruction ROM Max. Capacity 8K x 16 bits.
Table ROM Max. Capacity 8K/4K x 8/16 bits.
4. RAM Capacity. 960/480/240 x 4/8/16 bits.
LCD Max. Capacity 192/96/48 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.
SEG41~60 can be defined as IOB1~4, KI~4, ELC, ELP, BZB, BZ, IOD1~4, IOC1~4 by mask option.
1/4~1/9 Duty can be selected by mask option.
1/3~1/4 Bias can be selected by mask option.
Single instruction to turn off all segments.
COM5~9 can be defined as CMOS or P_open drain type output port 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.
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 SEG49 and SEG50 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, RFC0~2. Can be defined as IOA1~4 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 the content at any time
Merge 2 or 3 timers into one 12-bit or 18-bit timer
Used as a counter for RFC
14. Watchdog timer.
15. Built-in voltage charge halver & 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.
