资 源 简 介
The mPD754144 and 754244 are 4-bit single-chip microcontrollers with internal EEPROM for key-less entry. These devices are incorporated with 16 x 8-bit EEPROM, CPU for arithmeTIc operaTIons, 4-Kbyte mask ROM to store software,128 x 4-bit RAM to store arithmeTIc data, and a carrier generator to easily output waveforms for infrared ray remote controllers.FEATURES• Internal EEPROM: 16 x 8 bits (data memory area)• Program memory (ROM) : 4096 x 8 bits• Data memory (staTIc RAM): 128 x 4 bits• Instruction execution time· mPD754144 : 4 ms (system clock; at fX = 1 MHz)· mPD754244 : 0.95 ms (system clock; at fX = 4.19 MHz)• Oscillation circuit for system clock· mPD754144 : RC oscillation circuit (resistors and capacitors are external)· mPD754244 : crystal or ceramic oscillation circuit• Low voltage operation : VDD = 1.8 to 6.0 V· Can be driven by one lithium battery• MkI mode/MkII mode switching function• Timer function (4 channels)· Basic interval timer/watchdog timer : 1 channel· 8-bit timer counter : 3 channels
