UPD550

NEe Microcomputers, Inc. 4-81T SINGLE CHIP MICROCOMPUTER NEe fLPD550 OESCR IPTION The f,lPD550 is a f,lCOM-45 4-bit single chip microcomputer with high voltage outputs that can be pulled to - 35V for direct interfacing to vacuum fluorescent displays_ The f,lPD550 is manufactured with a standard PMOS process, allowing use of a single -10V power supply_ The f,lPD550 provides all of the hardware features of the f,lCOM-45 family, except that it has a 640 x 8 bit ROM to reduce device cost_ The f,lPD550 executes all 58 instructions of the f,lCOM-45 instruction set_ PIN CONFIGURATION Cll PCo PCl PC2 PC3 PDO PDl PD2 PD3 PEO PEl PE2 PE3 VSS Clo VGG RESET iN'f PA3 PA2 PAl PAO PGO PF3 PF2 PFl PFo TEST PIN NAMES PAO-PA3 PCO-PC3 PDO-PD3 PEO-PE3 PFO-PF3 f'GO ClO-Cll INT RESET VGG VSS TEST Input Port A Input/Output Port C Input/Output Port D Output Port E Output Port F Output Port G External Clock Signals Interrupt Input Reset Power Suppl y Negative Power Supply Positi ve Factorv Test Pi n (...