Overview
The LC72358N, LC72362N, and LC72366 are 1.33 µs instruction execution time single-chip microcontrollers for electronic tuning applications. These products incorporate a high-speed locking circuit and a high-performance direct PLL circuit that can control the local oscillator C/N characteristics. These products have 256 or 512 bytes of RAM and 16K, 24K or 32K bytes of program ROM on chip, and incorporate a three-channel serial I/O interface, a six-channel A/D converter and other interfaces.

Features
• ROM
   — LC72358N: 8K steps (8191 × 16 bits)
   — LC72362N: 12K steps (12287 × 16 bits)
   — LC72366: 16K steps (16383 × 16 bits)
      The subroutine area in both products is 4K steps
      (4095 × 16 bits).
• RAM
   — LC72358N, 72362N: 512 × 4 bits (banks 0 to 7)
   — LC72366: 1K × 4 bits (banks 0 to F)
• Stack: Eight levels
• Serial I/O:
   Three channels (8-bit 3-wire format)
   There are three internal serial clocks: 12.5 kHz,
   37.5 kHz and 187.5 kHz.
• External interrupts:
   Two channels (the INT0 and INT1 pins)
   Switching between rising and falling edge detection is
   supported.
• Internal interrupts:
   Three channels
   — Two internal timer interrupt channels
      The timers provide eight interrupt periods: 100 µs,
      1 ms, 2 ms, 5 ms, 10 ms, 50 ms, 125 ms and 250 ms.
   — One serial I/O interrupt channel
• Multiple interrupt levels:
   Four levels
   Hardware priority order
   INT0 pin > INT1 pin > SI/O pin > internal timer 0 >
   internal timer 1
• A/D converter: Six channels (6-bit successive approximation type)
• General-purpose ports
   — Input ports: 10
   — Output ports: 28
   — I/O ports: 25 (These pins can be switched between input and output in bit units.)
• PLL block
   — Built-in sub-charge pump for high-speed locking
   — Support for dead zone control
   — Built-in unlock detection circuit
   — Twelve reference frequencies: 1, 3, 3.125, 5, 6.25, 9, 10, 12.5, 25, 30, 50 and 100 kHz
• Universal counter: 20 bits
   Supports frequency and period measurement with counting periods of 1, 4, 8 and 32 ms.
• Timers: Timer interrupt periods
   100 µs, 1 ms, 2 ms, 5 ms, 10 ms, 50 ms, 125 ms and 250 ms
• Beep: Six frequencies: 2.08 kHz, 2.25 kHz, 2.5 kHz, 3.0 kHz, 3.75 kHz, 4.17 kHz.
• Reset: Built-in voltage detection type reset circuit
• Cycle time: 1.33 µs (all instructions execute in one cycle)
• Halt mode: The microcontroller operating clock is stopped in halt mode.
   There are four types of event that clear halt mode: interrupt requests, timer FF overflows, key inputs, and hold pin inputs.
• Operating supply voltage: 4.5 to 5.5 V (3.5 to 5.5 V when only the controller block operates)
• Package: QFP80E (QIP80E)
• OTP version: LC72P366
• Development tools:
   Emulator .................RE32N
   Evaluation chip.......LC72EV350
   Evaluation chip board ................................EB-72EV350