Overview
The LC72341G/W, LC72342G/W, and LC72343G/W are single-chip microcontrollers with both a 1/4-duty 1/2-bias LCD driver circuit and a PLL circuit that can operate at up to 250 MHz integrated on the same chip. These ICs are ideal for use in portable audio equipment.
Functions
⢠High-speed programmable divider
⢠Program memory (ROM)
â LC72341G/W: 2048 words à 16 bits (4KB)
â LC72342G/W: 3072 words à 16 bits (6KB)
â LC72343G/W: 4096 words à 16 bits (8KB)
⢠Data memory (RAM)
â LC72341G/W: 128 words à 4 bits
â LC72342G/W: 192 words à 4 bits
â LC72343G/W: 256 words à 4 bits
⢠Instruction cycle time
â 40 µs (for all single-word instructions.)
⢠Stack
â 4 levels (LC72341G/W)
â 8 levels (LC72342G/W, and LC72343G/W)
⢠LCD driver
â 48 to 80 segments (1/4-duty 1/2-bias drive)
⢠Timer interrupts
â One timer circuit providing intervals of 1, 5, 10, and 50 ms.
⢠External interrupts
â One external interrupt (INT)
⢠A/D converter
â Two channels (5-bit successive approximation)
⢠Input ports
â 7 (Of which two can be switched to function as A/D converter inputs)
⢠Output ports
â 6 (Of which one can be switched to function as the BEEP tone output. Two ports are open-drain ports.)
⢠I/O ports
â 16 (Of which 8 can be selected to function as LCD ports as mask options.)
⢠PLL circuit
â Two types of dead band control are supported, and an unlock detection circuit is included.
Reference frequencies of 1, 3, 5, 6.25, 12.5, and 25 kHz can be provided.
⢠Input frequency range
â FM band: 10 to 130 MHz 130 to 250 MHz
â AM band: 0.5 to 15 MHz
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