YKP1568VG5 8- BIT MICROCONTROLLER FOR REMOTE CONTROL TRANSMITTERS The YKP1568VG5 is stand-alone microcontroller designate for use in remote control transmitters for a wide range of applications. The YKP1568VG5 for this purpose provides number of dedicated hardware functions for remote controller applications These include the following additional blocks to the YKP1568VG X core: - Interrupt Gate - Hardware Modulator - Output Driver - Watchdog Timer. When the transmitter is not in use the microcontroller is in STOP mode and the oscillator is HALTED. The AND gate from P1 Port line provides the wake-up to end STOP mode. The Hardware Modulator produces pulse bursts according to the required protocol. By software the `ON-time` and the `OFF-time` of each pulse and the number of pulses are controlled. The Output Driver can handle sufficient current to drive a single transistor, and this can provide the required current for the LED. The Watchdog Timer will reset the YKP1568VG5 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, so then the Watchdog Timer is not running. Device is functionally identical to the PCA84c122A, Philips. FEATURES. Two test input T0 ( ANDed with P1 input lines ), T1 3 single-level vectored interrupt sources: external ( T0/INT and Port 1, for keypad press wake-up functions), timer/counter ( T1 ) and hardware modulator interrupt 8-bit programmable timer/counter with 5-bit pre-scalier On-board oscillator 1MHz to 6MHz. Single supply voltage from 2.0 V to 5.5 V. Operating temperature range : -20 to +500 C Power saving modes: Idle and Stop modes are provided `Hardware Modulator` that provides pulse bursts of which the `on` time and `off` time of each pulse (i.e. duty cycle) and the number of pulses are programmable One output line from the `Hardware Modulator` to control the driver transistor for the IR-LED. Capable of sinking 27 mA at Vdd=2.0V, Vout=1.0V Watchdog Timer to keep the transmitter from being locked or malfunction. Automatic system reset is generated by the WDT if the timer is not reset before overflow from counting within a certain period of time. DC CHARESTERISTICS. Supply voltage, V Supply current operating mode, mA Operating crystal frequency, MHz Sink current LOW, mA Pull-up output source current HIGT, µA Sink current LOW (for pulse output OUT), mA Source current HIGT (for pulse output OUT), mA Korzhenevskogo 12, Minsk, 220064, Republic of Belarus Fax: +375 (17) 278 28 22, Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61, 277 69 16 E-mail: [email protected] URL: www.bms.by 2.0 ... 5.5 1.8 6.0 1.6 -40 27 -1.6 YKP1568VG5 PIN DESCRIPTION SYMBOL P00 P01 P02 P03 P04 P05 P06 P07 P10 P11 P12 P13 P14 P15 P16 P17 TO/INT T1 RESET XTAL 1/2 OUT Vdd Vss PIN 3 2 23 22 10 11 14 15 19 18 17 16 1 22 12 13 4 5 6 9,8 21 7 20 DESCRIPTION standard I/O Port line, generally for keypad scanning standard I/O Port line, generally for keypad scanning test TO and external interrupt input test T1 input active HIGH reset, normally tied to Vss crystal or ceramic resonator pulse train output pin, capable of sinking 27 mA power supply ground BLOCK DIAGRAM Udd XTAL ROM 1Kx8 RAM 32byte OSCILLATOR HARDWARE MODULATOR WDT KP1568 VGX CORE TO/INT Uss P01 P03 P05 P07 P00 P02 P04 P09 P06 P08 P11 P13 P15 P17 P10 P12 P14 P16 Korzhenevskogo 12, Minsk, 220064, Republic of Belarus Fax: +375 (17) 278 28 22, Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61, 277 69 16 E-mail: [email protected] URL: www.bms.by TO/INT OUTPUT DRIVER OUT