2

MB89143A/144A

(Continued)

• Two types of timers

8/16-bit timer/counter (also usable as two 8-bit timers)

21-bit time-base timer

• One 8-bit serial interface

Switchable transfer direction allows comunication with various equipment.

• 8-bit A/D converter: 8 channels

Successive approximation type

• External interrupt: 2 channels

Two channels are independent and capable of wake-up from low-power consumption modes. (Rising edge/

falling edge/both edges selectability)

–0.3 V to +7.0 V can be applied to INT1 (N-ch open-drain)

• Low-power consumption modes

Subclock mode (The main clock stops, and the device operates at the subclock.)

Watch mode (Only the watch prescaler is operating.)

Stop mode (Oscillation stops to minimize the current consumption.)

Sleep mode (The CPU stops to reduce the current consumption to approx. 1/3 of normal.)

• Watch prescaler

• Buzzer output

• Watchdog reset, reset output, and power-on reset functions