Overview

The LC72336 and LC72338 are single-chip microcontrollers for use in electronic tuners. These products include on chip a PLL circuit that can operate at up to 150 MHz and 1/3 duty LCD drivers. They feature a highly efficient instruction set and powerful hardware.

Functions

• High-speed programmable divider

• Program memory (ROM)

   — LC72336: 6143 × 16 bits (12 kB)

   — LC72338: 8191 × 16 bits (16 kB)

• Data memory (RAM): 512 × 4 bits

• All instructions are one-word instructions

• Cycle time: 1.33 µs

• Stack: 8 levels

• LCD drivers: Up to 96 segments (1/3 duty, 1/3 bias)

• Serial I/O: Up to 3 channels (8-bit 3-wire type)

• External interrupts: 2 interrupts (INT0, INT1)

   Interrupt on rising or falling edge (selectable)

• Internal interrupts: 3 interrupt

   Two built-in timer interrupts and 1 serial I/O interrupt

• Nested interrupt levels: 4 levels

• D/A converter: 4 channels (8-bit PWM output)

• A/D converter: 4 channels (6-bit successive approximation)

• General-purpose ports:

   — Input ports: 8

   — Output ports: 12 (16 maximum)

   — I/O ports: 8 (20 maximum, can be switched between input and output in bit units.)

• PLL block: Supports 4 types of dead zone control, and includes a built-in unlock detection circuit.

   Supports 12 different reference frequencies.

• Universal counter: 20 bits (Can be used for either frequency or period measurement.)

• Timers: Eight types of time measurement

• Beep function: Six beep tones

• Reset: Built-in voltage detection type reset circuit

• Halt mode: Stops the controller operating clock.

• Operating supply voltage: 4.5 to 5.5 V (3.5 to 5.5 V if only the controller block operates.)