Description
The HD404019R series are HMCS400-series CMOS 4-bit single-chip microcomputers. Each device incorporates a ROM, RAM, I/O, serial interface, and two timer/counters, and contains high-voltage I/O pins including high-current output pins to directly drive fluorescent displays.

FEATUREs
• 16,384-word × 10-bit ROM
- Mask ROM: HD404019R, HD40L4019R
- PROM: HD4074019, HD407L4019
• 992-digit × 4-bit RAM
• 58 I/O pins, including 26 high-voltage I/O pins (40 V max.)
• Two timer/counters
- 8-bit free-running timer
- 8-bit auto-reload timer/counter
• Clock synchronous 8-bit serial interface
• Five interrupt sources
- Two by external sources
- Two by timer/counters
- One by serial interface
• Subroutine stack, up to 16 levels including interrupts
• Minimum instruction execution time: 0.89 µs
• Low-power dissipation modes
- Standby: Stops instruction execution while allowing clock oscillation and interrupt functions to operate
- Stop: Stops instruction execution and clock oscillation while retaining RAM data
• On-chip oscillator
- Crystal or ceramic oscillator
- External clock
• Packages
- 64-pin shrink type plastic DIP
- 64-pin flat plastic package
- 64-pin shrink type ceramic DIP with window