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TM8705

Features: 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 mani...

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SeekIC No. : 004523410 Detail

TM8705: Features: 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 manip...

TM8705 Data Sheet

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Part Number:
TM8705
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

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.
External factors 4 (INT pin, Port IOC, IOD & KI input).
Internal factors 4 (Pre-Divider, Timer1, Timer2 & RFC).
8. Built-in EL-light driver.
ELC, ELP (Muxed with SEG28, SEG29).
9. Built in Alarm, clock or single tone melody generator.
BZB, BZ (Muxed with SEG30, SEG31).
10. Built-in resistance to frequency converter.
CX, RR, RT, RH (Muxed with SEG24 ~ SEG27).
11. Built in key matrix scanning function.
K1~K16 (Shared with SEG1~SEG16).
12. KI1~KI4 (Muxed with SEG32 ~ SEG35).
13. Two 6-bit programmable timer with programmable clock source.
14. Watch dog timer.
15. Built-in Voltage doubler, halver, tripler charge 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.


Application

Timer / Calendar / Calculator / Thermometer


Specifications

Name
Symbol
Range
Unit
Maximum Supply Voltage
VDD
-0.3 to 5.5
V
VDD 1
-0.3 to5.5
V
VDD 2
-0.3 to 8.5
V
Maximum Input Voltage
Vin
-0.3 to VDD1/2+0.3
V
Maximum output Voltage
Vout1
-0.3 to VDD1/2+0.3
V
Vout2
 -0.3 to VDD3+0.3
V
Maximum Operating Temperature
Topg
-20 to +70
Maximum Storage Temperature
Tstg
-25 to +125



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 cessing 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.




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