Description

The HD404344R series and HD404394 series 4-bit microcomputers are products of the HMCS400 series, which is designed to make application systems compact while realizing higher performance and increasing program productivity.

Features

? Input/output pins

― HD404344R series, HD4074344: 22 pins

(10pins: Large-current I/O pins)

― HD404394 series: 21 pins

(3 pins: intermediate-voltage NMOS open drain I/O; 5 pins: NMOS open drain I/O with 15-mA high-current driver)

? Two timer/counters

― One timer output

― One event counter input (with programmable edge detection)

? 8-bit clock-synchronous serial interface (1 channel)

? On-chip A/D converter

― HD404344R series, HD4074344: 8 bit × 4 channel

― HD404394 series: 8 bit × 3 channel (with Vref pin)

? Built-in oscillator

― HD404344R Series

Ceramic oscillator, CR oscillation, External clock drive is also possible.

― HD404394 Series, HD4074344

Ceramic oscillator, External clock drive is also possible.

? Five interrupt sources

― One by external source (with programmable edge detection)

― Four by internal sources

? Subroutine stack

― Maximum 16 levels including interrupts

? Two low-power dissipation modes

― Standby mode

― Stop mode

? One input signal to return from stop mode

? Instruction cycle time

― 1 μs (fOSC = 4 MHz)