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
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