LC723781N/723782N/723783N/723784/723785

No.8011-2/14

• Serial I/O

: Three channels. These circuits can support both 2-wire and 3-wire 8-bit communication

techniques, and can be switched between MSB first and LSB first operation.

One of six internally generated serial transfer clock rates can be selected: 12.5kHz,

37.5kHz, 187.5kHz, 281.25kHz, 375kHz, and 450kHz

• External interrupts

: Seven interrupt inputs (pins INT0 through INT5, and the HOLD pin)

These interrupts can be set to switch between rising and falling edges, although the

HOLD pin only supports falling edge detection.

• Internal interrupts

: Seven interrupts ; four internal timer interrupts, and three serial I/O interrupts.

Functions (Continued)

• Interrupt nesting levels

: 16 levels

Interrupts are prioritized in hardware as follows :

HOLD pin>INT0 pin>INT1 pin>INT2 pin>INT3 pin>INT4 pin>INT5 pin>

S-I/O0>S-I/O1>S-I/O2>Internal TMR0>Internal TMR1>Internal TMR2>

Internal TMR3

• A/D Converter

: 8-bit resolution and 8 inputs

• General-purpose ports

: Input ports : 13

Output ports : 4

I/O ports : 62 (These pins can be switched between input and output in 1-bit units.)

• PLL block

: Includes a sub-charge pump for high-speed locking.

Supports dead zone control.

Built-in unlock detection circuit

Twelve reference frequencies : 1kHz, 3kHz, 3.125kHz, 5kHz, 6.25kHz, 9kHz,

10kHz, 12.5kHz, 25kHz, 30kHz, 50kHz, and 100kHz

• Universal counter

: This 20-bit counter can be used for either frequency or period measurement and

supports four measurement (calculation) periods : 1ms, 4ms, 8ms, and 32ms

• Timers

: Two fixed timers and two programmable timers (8-bit counters)

TMR0

: Supports four periods : 10

µs, 100µs, 1ms, and 5ms

TMR1

: Supports four periods : 10

µs, 100µs, 1ms, and 10ms

TMR2 and TMR3 : Programmable 8-bit counters.

Input clocks with 10

µs, 100µs, and 1ms

One 125-ms timer flip-flop provided

• Beep circuit

: Provides 12 fixed beep tones :

500Hz, 1kHz, 2kHz, 2.08kHz, 2.2kHz, 2.5kHz, 3kHz, 3.125kHz, 3.33kHz,

3.75kHz, 4.17kHz, and 7.03kHz

Programmable 8-bit beep tone generator.

Reference clocks with frequencies of 50kHz, 15kHz, and 5kHz.

• Reset

: Built-in voltage detection reset circuit

External reset pin

• Cycle time

: 1.33

µs/833ns (All instructions are one word), X’tal : 4.5MHz/7.2MHz

Supports software switching (Initial cycle time is 1.33

µs)

• Halt mode

: The microcontroller operating clock is stopped in Halt mode.

There are four conditions that can clear Halt mode : Interrupt requests,

timer flip-flop overflows, port PA inputs, and HOLD pin inputs.

• Operating supply voltage : 4.5 to 5.5V (Microcontroller block only : 3.5 to 5.5V)

• Package

: QIP100E

• OTP version

: LC72F3781

• Development tools

: Emulator

: RE128V

Evaluation chip

: LC72EV3780

Evaluation board

: EB-72EV3780