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PCA84C622AP Datasheet(PDF) 3 Page - NXP Semiconductors |
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PCA84C622AP Datasheet(HTML) 3 Page - NXP Semiconductors |
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3 / 24 page  1995 May 01 3 Philips Semiconductors Product specification 8-bit microcontrollers for remote control transmitters PCA84C122; 222; 422; 622; 822 1 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. 2 GENERAL DESCRIPTION The PCA84C122 is a stand-alone microcontroller designed for use in remote control transmitters for a wide range of applications. The PCA84C122 provides a number of dedicated hardware functions for remote controller applications. These functions include the following additional blocks to the 84CXXX core: • Interrupt Gate • Hardware Modulator • Output Driver • Watchdog Timer. Although the PCA84C122 is specifically referred to throughout this data sheet, the information applies to all the devices. The differences between the PCA84C122 and the other devices are specified in Chapter 3. Figure 2 shows the general block diagram of the device. The 84CXXX core plus 8 kbytes ROM and 64 bytes RAM has the same function as described in the PCF84CXXX family description (see “Data Handbook IC14”). When the transmitter is not in use the microcontroller is in Stop mode and the oscillator is halted. The AND gate connected to the Port 1 (P10 to P17) lines provides the wake-up to end the Stop mode. The Hardware Modulator produces pulse bursts according to the required protocol. The ON-time and OFF-time of each pulse (i.e. duty factor) and the number of pulses are controlled by software. The Watchdog Timer (WDT) will reset the PCA84C122 when it has not been reloaded (reset) in time, because the program has run out of sequence (endless loop, continuous Idle mode, etc.). During Stop mode the oscillator is halted, therefore the Watchdog Timer is not running. Automatic system reset is generated by the WDT if the timer is not reset before overflow from counting within a certain period of time. The Output Driver can handle sufficient current to drive a single transistor, that provides the required current for the IR-LED. 2.1 Important note This data sheet details the specific properties of the PCA84C122; PCA84C222; PCA84C422; PCA84C622 and PCA84C822. The shared characteristics of the family of microcontrollers are described in the PCF84CXXXA Family single-chip 8-bit Microcontroller of “Data Handbook IC14”, which should be read in conjunction with this data sheet. |
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