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a family of [https://en.wikipedia.org/wiki/Hitachi Hitachi] [https://en.wikipedia.org/wiki/4-bit_computing 4-bit] [https://en.wikipedia.org/wiki/CMOS CMOS][https://en.wikipedia.org/wiki/Microcontroller microcontroller] (MCU) .
The single-chip controller series provide various amounts of [[Memory#ROM|ROM]] of 10-bit words (code and pattern) and [[Memory#RAM|RAM]] of up to 160 [[Nibble|nibbles]],
[https://en.wikipedia.org/wiki/Parallel_I/O parallel I(O] aimed for driving dot matrix [https://en.wikipedia.org/wiki/Liquid-crystal_display LCD], timer/counter and [https://en.wikipedia.org/wiki/Programmable_interrupt_controller interrupt controller].
=Architecture=
