UPD4701A General Description
The PD4701A is a counter for an X, Y 2-axis incremental encoder. When a two-phase encoder signal is inputfor the X and Y axes, direction discrimination and computation is performed, and count data is output in 8-bit parallelform. In addition, a 3-contact-point input buffer is incorporated, which is useful for applications which use a pointingdevicesuch as a mouse or track-ball. The CPU checks the switch input flag or count flag and reads the 12-bit countdata in twooperations, one for the lower byte and one for the upper byte. The key input flag is output together withthe count data in the upper byte.
UPD4701A Connection Diagram
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