■ GENERAL DESCRIPTION
The NJU3503 is the C-MOS 4-bit Single Chip Micro Controller consisting of the 4-bit CPU Core, Input / Output Selectable I/O ports, Program ROM, Data RAM, Dual Timer/Counter, 8-bit Serial Interface, 8-bit A/D Converter, and Oscillator Circuit (CR or Ceramic or Xtal). It realizes the control for home appliances or toys by only few external components.
The NJU3503 is suitable for battery operated appliances because of low operating current, wide operating voltage range, and STANDBY function (HALT mode).

■ FEATURES
● Internal Program ROM 2048 X 8 bits
● Internal Data RAM 128 X 4 bits
● Input / Output Port 20 lines(MAX) / NJU3503L
                                  20 lines(MAX) / NJU3503M
   12 lines ⋅⋅⋅ Input / Output direction of each bit is selected by the mask option.
   8 lines ⋅⋅⋅ Input / Output direction of each bit can be changed by the program.
                  Additional functions by the mask option.
   External Interrupt Terminal : EXTI/PF0
   External Clock Input Terminal for Timer2 : CNTI/PF1
   Serial Interface Terminals : SDO/PL0, SDI(O)/PG1
   A/D Converter Interface Terminals : ADCK/PC0,VREF/PC1,AIN0~3/PD0~3,AIN4~5/PE0~1
● High Output-Current terminal (11 lines) : PA0~PA3, PD0~PD3, PE0~PE2
   N-Channel FET Open Drain Type (IOL) 15mA at VDD=5V
● Instruction Set 59 instructions
● Subroutine Nesting 8 levels
● Pulse Edge Detector
   The rising or falling edge of a pulse is selected by the mask option.
● Instruction Executing Time 6/fOSC sec (1.5µsec at 4MHz)
● Operating Frequency Range 30kHz to 4MHz
● Internal Oscillator
   CR, or Ceramic, or Xtal oscillation and External clock input
● STANDBY function (HALT mode)
● Wide operating voltage range 2.4V to 5.5V
● 8-bit Serial Input / Output port
● Timer/Counter
   (Timer1 : 8-bit re-load type timer, Timer2 : 8-bit re-load type timer event counter )
   (Count clock : Timer1’s clock is an internal one. Timer2’s clock is an internal or external one.)
● 8-bit A/D converter (Multiplexed 6-channel input )
● Interrupt factor 4 (external, timer1, timer2, serial Input / Output)
● C-MOS technology
● Package outline SDIP28 / SDMP30