GENERAL DESCRIPTION

The PCA84C122 is a stand-alone microcontroller designed for use in remote control transmitters for a wide range of applications.

FEATURES

• 84CXXX CPU

• ROM, RAM and I/O configurations are device dependent; see Chapter 3

• Two test inputs: T0 (ANDed with Port 1 input lines) and T1

• 3 single-level vectored interrupt sources:

  – external (T0/INT and Port 1, for keypad press wake-up function)

  – timer/counter (TI)

  – hardware modulator interrupt

• 8-bit programmable timer/counter with 5-bit pre-scaler

• Power saving: Idle and Stop modes are provided

• Hardware Modulator providing pulse bursts, with:

  – programmable duty factor for each pulse

  – programmable number of pulses

• One output line from the Hardware Modulator to control the driver transistor for the infrared LED (IR-LED).

  Capable of sinking 27 mA at VDD = 2.0 V, VOUT = 1.0 V

• Watchdog Timer to keep the transmitter from being locked or malfunction

• Available packages: SO and DIP types (SO20, SO24, SO28, SDIP24 and DIP20); see Chapter 4

• On-chip oscillator: 455 kHz to 6 MHz

• Single supply voltage: 2.0 V to 5.5 V

• Operating temperature: −20 to +50 °C.