UPD7520 Datasheet - NEC

UPD7520 4-BIT SINGLE CHIP MICROCOMPUTER

Data Pointer Registers The 2-bit H register and 4-bit L register are two registers which reside externally to the 48 x 4 bit RAM _They function as the Data Pointer, addressing the rows and columns of the RAM, respectively _They are individually accessible, and the L register can be automatically in.

NEe Microcomputers, Inc. NEe ,.,.PD7520 4-BIT SINGLE CHIP MICROCOMPUTER DESCR IPTION The j.lPD7520 is a IlCOM-75 4-bit single chip microcomputer with a Programmable Display Controller capable of directly driving a multiplexed 8-segment, 8-digit LED Display. It has a 768 x 8 ROM, a 48 x 4 RAM, and 24 I/O lines for communication with and control of external circuitry. The j.lPD7520 is manufactured with a lowpower consumption PMOS process, allowing use of a single power supply between -6V and -.

UPD7520-NEC.pdf