Description
The HD404818 Series of 4-bit single-chip HMCS400 series microcomputers provide high program productivity. It incorporates a large size memory, LCD controller/driver, voltage comparator, and 32-kHz watch oscillator circuit.
The HD404818 Series has both standard voltage versions and low voltage versions available. The standard voltage versions operate at 4.0 V to 6.0 V (mask ROM version) and 4.0 V to 5.5 V (PROM version), while the low voltage versions operate at 2.7 V to 6.0 V (mask ROM) and 3.0 V to 5.5 V (PROM). Low voltage versions include an L in their product name.

Features
•  2048-word ×10-bit ROM (HD404812, HD40L4812)
•  4096-word ×10-bit ROM (HD404814, HD40L4814)
•  6144-word ×10-bit ROM (HD404816, HD40L4816)
•  8192-word ×10-bit ROM (HD404818, HD40L4818, HD4074818, HD407L4818)
•  1184-digit ×4-bit RAM
•  30 I/O pins, including 10 high-current output pins, all CMOS and programmable as I/O pull-up MOS
•  LCD controller/driver (32 segments ×4 commons)
•  Three timer/counters
•  Clock-synchronous 8-bit serial interface
•  Six interrupt sources
    -Two by external sources
    -Four by internal sources