Details of functions are described in the User's Manual shown below. The µPD7554A has outputs to directly drive a triac and LEDs and allows selection among many types of input/ output circuits using their respective mask options, sharply reducing the number of external circuits required. It is optimized for distributed processing of the system. This device incorporates a serial interface, and serves as the sub-CPU for a high-order model of that series or the 8-bit microcomputer. The is a low-order model in the µPD7500 series (µPD7554A only). The is a product of the µPD7554, 7564 sub-series which a 4-bit single-chip microcomputer with a small number of ports in a small package, which is enabled to operate even at the super-low voltage V so that it is optimized for handy-type systems operating with dry cells.
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