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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 ?s

? 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