LC866548/40/32/28/24A

No.6700-3/21

(8) Timers

- Timer 0 : 16-bit timer/counter with 2-bit prescaler + 8-bit programmable prescaler

Mode 0 :

Two 8-bit timers with programmable prescaler

Mode 1 :

8-bit timer with a programmable prescaler + 8-bit counter

Mode 2 :

16-bit timer with a programmable prescaler

Mode 3 :

16-bit counter

- Timer 1 : 16-bit timer/PWM with

Mode 0 :

Two 8-bit timers

Mode 1 :

8-bit timer + 8-bit PWM

Mode 2 :

16-bit timer

Mode 3 :

Variable-bit PWM (9-16 bits)

- Base timer

Every 500ms overflow system for a clock application (using 32.768kHz crystal oscillation for Base timer

clock)

Every 976

clock)

The Base timer clock selectable ; 32.768kHz crystal oscillation, System clock, and programmable prescaler

output of Timer 0

(9) Buzzer output

- The Buzzer sound frequency selectable ; 4kHz, 2kHz (using 32.768kHz crystal oscillation for Base timer clock)

(10) Remote control receiver circuit (connected to the P73/INT3/T0IN terminal)

- Noise rejection function (the time constant of noise rejection filter : 1tCYC/16tCYC/64tCYC)

(tCYC : instruction cycle time)

- Polarity switching

(11) Watchdog timer

- The watchdog timer is taken on RC outside

- Watchdog timer operation selectable : interrupt system, system reset

(12) Interrupt system

- 14-source 10-vectored interrupts :

1. External Interrupt INT0 (include watchdog timer)

2. External Interrupt INT1

3. External Interrupt INT2, Timer/counter T0L (Lower 8 bits)

4. External Interrupt INT3, base timer

5. Timer/counter T0H (Upper 8 bits)

6. Timer T1H / T1L

7. Serial interface SIO0

8. Serial interface SIO1

9. AD converter

10. VFD automatic display controller, Port 0

- Built-in Interrupt priority control register

Microcontroller allows 3 levels of interrupt ; low level, high level, and highest level of multiplex interrupt. It can

specify a low level or a high level interrupt priority from INT2/T0L through port 0 (i. e. the above interrupt

number from three through ten). It can also specify a low level or the highest level interrupt priority to INT0 and

INT1.

(13) Subroutine stack levels

- 128 levels (Max.) : Stack area included in RAM area