Overview

The LC72321 is a single-chip microcontroller for use in

electronic tuning applications. It includes on chip both

LCD drivers and a PLL circuit that can operate at up to

150 MHz. It features a large-capacity ROM, a highly

efficient instruction set, and powerful hardware.

Functions

• Serial I/O

• Built-in timer interrupts: 80 µs, 1 ms, 2 ms and 5 ms

• Stack: Eight levels

• Beep control: Six beep tones (2.08, 2.25, 2.5, 3.0, 3.75,

and 4.17 kHz)

• Fast programmable divider

• General-purpose counters: HCTR for frequency

measurement and LCTR for frequency or period

measurement

• LCD driver for displays with up to 56 segments

(1/2 duty, 1/2 bias)

• Program memory (ROM): 16 bits

× 4095

• Data memory (RAM): 4 bits

× 256

• All instructions are single-word instructions

• Cycle time:

2.67 µs, 13.33 µs, or 40.00 µs (option)

• Unlock FF:

0.55 µs detection, 1.1 µs detection

• Timer FF:

1 ms, 5ms, 25ms, 125ms

• Input ports*: One dedicated key input port and one

high breakdown voltage port

• Output ports*: Two dedicated key output ports, one high

breakdown voltage open drain port

Two CMOS output ports (of which one

can be switched to be used as LCD driver

outputs)

Seven CMOS output ports (mask option

switchable to use as LCD ports)

• I/O ports*:

One switchable between input and output

in four-bit units and one switchable

between input and output in one-bit units

Note: * Each port consists of four bits

• Program runaway can be detected and a special address

set. (Programmable watchdog timer)

• Voltage detection type reset circuit

• One 6-bit A/D converter

• Two 8-bit D/A converters (PWM)

• One external interrupt (The LC72321 provides an

external interrupt, and internal interrupt and a serial I/O

interrupt, one of which can be selected under program

control.)

• Hold mode for RAM backup

• Sense FF for hot/cold startup determination

• PLL: 4.5 to 5.5 V

• CPU: 3.5 to 5.5 V

• RAM: 1.3 to 5.5 V

Package Dimensions

unit: mm

3174-QIP80E

CMOS LSI

83194TH (OT) No. 4796-1/13

Preliminaly

SANYO: QIP80E

[LC72321]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

Single-Chip Microcontroller with PLL

and LCD Driver

LC72321

Ordering number : EN4796A