mitsubishi - Al Kossow's Bitsavers

MITSUBISHI MICROCOMPUTERSMELPS 8-41 SLAVE MICROCOMPUTERSFUNCTIONS OF MELPS 8-41 SLAVE MICROCOMPUTERSDESCRIPTIONThe MELPS 8-41 family is a general-purpose 8-bit CPUperipheral LSI microcomputer series configured internallywith a CPU, RAM, ROM, 1/0 ports, timer and other functions.These microcomputers function independently of externalconnections but since they operate based on the instructionsfrom the CPU (master CPU) that employs theseLSls as the peripheral LSls, they are known as slave microcomputers.Data is passed to and from the master CPU and slave microcomputersasynchronously through the buffer registersbuilt into the MELPS 8-41 and therefore, when seen fromthe master CPU side, the LSI can be treated in every waylike an ordinary peripheral LSI. Since the MELPS 8-41 has abuilt-in microcomputer, its functions can be changed easilysimply by altering the program of the internal ROM.MELPS 8-41SLAVE MICROCOMPUTER FAMILYInput clockType nameROM(MHz)(bytes)M5L8041 A-XXXP 6 1024M5L8042-XXXP 12 2048CapacityRAM(bytes)641281/0 Technology used(ports)18 ED NMOS18 ED NMOSBLOCK DIAGRAM OF MELPS 8-41DATA BUS INPUT/OUTPUT PORT 1AP1 s P1 7 'INPUT/OUTPUT PORT 2IIVce (5V)Voo (5V)Vss (OV)RESETSINGLE STEPTo TEST PINOT, TEST PIN 1R'------{ 7 EAEXTERNAL I/O CONTROLOUTPUTREADWRITECHIP SELECTADDRESSEXTERNAL ACCESSNote1: The M5L8042-XXXP has a 2048-word X 8-bit ROM.2 : The M5L8042-XXXP has a 128-word X 8-bit RAM.• MITSUBISHI..... ELECTRIC5-3