HD404818 Series
4-Bit Single-Chip Microcomputer
Preliminary
Rev. 2.0
Sept. 1998
Description
T he H D4 04 81 8 Se ri 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.
ZTAT
TM
: Zero Turn Around Time ZTAT is a trademark of Hitachi Ltd.
Features
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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
HD404818 Series
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Subroutine stack up to 16 levels, including interrupts
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Instruction cycle time:
1
µs
(f
OSC
= 4 MHz for HD404812/HD404814/HD404816/HD404818/HD4074818)
5
µs
(f
OSC
= 800 kHz for HD40L4812/HD40L4814/HD40L4816/HD40L4818/HD407L4818)
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Four low-power dissipation modes
Standby mode
Stop mode
Watch mode
Subactive mode
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Internal oscillator:
Main clock: Can be driven by ceramic oscillator, crystal oscillator, or external clock
Subclock: 32.768-kHz crystal
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Voltage comparator (2 channels)
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Package
80-pin plastic flat package
80-pin plastic thin flat package
(FP-80B, FP-80A)
(TFP-80)
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