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