§ General Description:

TC7668 MCU is an easyused 4bit CPU base microcont roller. It contains 1984word ROM(MTP), 144nibble RAM, timer/ counter, time base, watch dog timer, PWM, interrupt service, IO control hardware, LVR and touch pad feature for specified applications. The device is also suitable for diverse simple applications in control appliance and consumer product.

§ Features:

1. Tensilicon Cloud RISC 4bit CPU core

2. Total 26 crucial instructions and two addressing mode

3. Most instructions need 1 word and 1 machine cycle(2 system clocks) except read table instruction(RTB)

4. dvance CMOS process

5. Working memory with 1984*16 program ROM(MTP) and 144*4 SRAM

6. 4level stacks

7. LVR voltage can select 2.0V or 2.7V by register

8. Operating voltage: 3.5V~5.5V (LVR=2.7V); 2.2V~5.5V (LVR=2.0V)

9. System operating frequency: (at VDD=5V)

. Highspeed system oscillator(RC8M):

Builtin RC oscillator: 8MHz (typical) ± 5%

Highspeed system clock(OSCH): 4MHz (typical)

.Low speed peripheral oscillator(RC32K):

Builtin RC oscillator: 32KHz (typical) ± 30%

Lowspeed peripheral clock(OSCL): 32KHz (typical)

10. The MCU will go into low speed operation mode (RC32K on and RC8M off) automatically after power on or reset release.

11. Offer 2 IO + 3 touch pad or 5 general programmable IO

IO port builtin key wakeup feature enable by soft ware setting Providing external interrupt inputs

Offering internal signal outputs, like PWM

12. Two time base

Time base offers 2 various period interrupt request

13. One 8bit TCP1 autoreload timer/counter

4 kind clock sources selected by software

10. One 8bit TCP2 autoreload timer/counter, can impr ove PWM function 4 kind clock sources selected by software

11. Builtin 4 set 8bit PWM output

                12. MCU system protection and power saving controlled mode: Builtin watch dog timer (WDT) circuit

Builtin low voltage reset (LVR) function Out of user program’s range detection

Provide high/low system operating speed, sleep and stop mode for power saving control

13. 3 pins with touch pad detection

  14. Provides 8 interrupt sources

External: INT0, INT1 shared with IO pad

Internal: two timer/counter, two time base, two touch pad’s interrupt

15. Provide package types

                    SOP 8/SOT23-6/DFN8L