4-Bit Single-Chip Microcomputer
The H D4 04 81 8 Seri es 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.
Standard voltage versions: HD404812, HD404814, HD404816, HD404818, HD4074818
Low voltage versions: HD40L4812, HD40L4814, HD40L4816, HD40L4818, HD407L4818
The HD4074818 and HD407L4818, containing PROMs, are ZTAT™ microcomputers which can
dramatically shorten system development time and smoothly proceed from debugging to mass production.
ZTATTM : Zero Turn Around Time ZTAT is a trademark of Hitachi Ltd.
w • 2048-word × 10-bit ROM (HD404812, HD40L4812)
w • 4096-word × 10-bit ROM (HD404814, HD40L4814)
w • 6144-word × 10-bit ROM (HD404816, HD40L4816)
. • 8192-word × 10-bit ROM (HD404818, HD40L4818, HD4074818, HD407L4818)
D • 1184-digit × 4-bit RAM
a• 30 I/O pins, including 10 high-current output pins, all CMOS and programmable as I/O pull-up MOS
ta• LCD controller/driver (32 segments × 4 commons)
S• Three timer/counters
h• Clock-synchronous 8-bit serial interface
e• Six interrupt sources
e Two by external sources
t4U.com Four by internal sources