Description
The HD404339 Series is 4-bit HMCS400-Series microcomputer with large-capacity memory designed to increase program productivity. Each microcomputer has an A/D converter, input capture timer, and a 32-kHz oscillator circuit for clock use all built in. They also come with high-voltage I/O pins that can directly drive a fluorescent display.

Features
•  54 I/O pins
 One input-only pin
 53 input/output pins: 30 pins are high-voltage pins (40 V, max.)
•  On-chip A/D converter (8-bit ×12-channel)
•  Three timers
 One event counter input
 One timer output
 One input capture timer
•  8-bit clock-synchronous serial interface (1 channel)
•  Alarm output
•  Built-in oscillators
 Ceramic or crystal oscillator
 External clock drive is also possible
 Subclock: 32.768-kHz crystal oscillator
•  Seven interrupt sources
 Two by external sources
 Three by timers
 One each by the A/D converter and serial interface
•  Four low-power dissipation modes
 Standby mode
 Stop mode
 Watch mode
 Subactive mode
•  Instruction cycle time: 1 µs (fOSC= 4 MHz, 1/4 division ratio)
 1/4, 1/8, 1/16, 1/32 system clock division ratio can be selected