UPD557L

NEe Microcomputers, Inc. 4-81T SINGLE CHIP MICROCOMPUTER NEe JLPD557L DESCR IPTION The pP0557L is a pCOM-43 4-bit single chip microcomputer with high voltage outputs,and low power consumption. The outputs can be pulled to- 35V' for direct interfacing to vacuum fluorescent displays. The pPD557L is manufactured with a lowpower-consumption PMOS process, allowing use of a -8V, low current power supply. The pPD557L provides all of the hardware features of the pCOM-43 family, except that it has 21 I/O lines in a 28-pin dual-in-line package to reduce device cost. The pP0557 L executes all 80 instructions of the pCOM-43 instruction set. PIN CONFIGURATION Cl, PCo 2 PC, 3 PC2 4 PC3 5 PDO 6 PD, 7 pPO PD2 8 557L PD3 9 PEO PEl PE2 PE3 VSS Clo VGG RESET INT PA3 PA2 PAl PAO PGO PF3 PF2 PF, PFo TEST PIN NAMES PAO-PA3 PCO-PC3 PDO-PD3 PEO-PE3 PFO-PF3 PGO INT ClO-Cl, RESET VGG VSS TEST Input Port A Input/Output Port C Input/Output Port D Output Port E Output Port F Output Port G Interrupt Input E...