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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.