HD404318 Series
Rev. 6.0
Sept. 1998
Description
The HD404318 Series is 4-bit HMCS400-series microcomputer with large-capacity memory designed to
increase program productivity. Each microcomputer has an A/D converter and input capture timer built in.
They also come with high-voltage I/O pins that can directly drive a fluorescent display.
The HD404318 Series includes four chips: the HD404318 with 8-kword ROM; the HD404316 with 6-
kword ROM; the HD404314 with 4-kword ROM; the HD4074318 with 8-kword PROM.
The HD4074318 is a PROM version ZTAT鈩?microcomputer. Programs can be written to the PROM by a
PROM writer, which can dramatically shorten system development periods and smooth the process from
debugging to mass production. (The PROM program specifications are the same as for the 27256.)
ZTAT鈩? Zero Turn Around Time ZTAT is a trademark of Hitachi Ltd.
Features
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34 I/O pins
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One input-only pin
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33 input/output pins: 21 pins are high-voltage pins (40 V, max.)
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On-chip A/D converter (8-bit
脳
8-channel)
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Three timers
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One event counter input
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One timer output
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One input capture timer
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8-bit clock-synchronous serial interface (1 channel)
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Alarm output
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Built-in oscillators
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Ceramic or crystal oscillator
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External clock drive is also possible
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