mitsubishi - Al Kossow's Bitsavers

MI.TSUBISHI MICROCOMPUTERSPCA4040MELPS 740 DEDICATED BOARD (MS0740-XXXSP, M S0741-XXXSP)DESCRIPTIONThe PCA4040 MELPS 740 dedicated board is for use withthe PC4000 debugging machine for the M50740-XXXSP, andM50741-XXXSP single-chip 8-bit microcomputer, and it isused by inserting the board in the PC4000 cabinet. 'FEATURES• Connection to user's system by a flat cable• Single-step operation and breakpoint operation capabilityfrom the PC4000 debugging machil)e keyboard. Debuggingfunctions such as confirmation and modificationof internal register contents.APPLICATIONSDevelopment of hardware and software for systems usingthe MELPS 740 (M50740-XXXSP and M50741-XXXSP) single-chipmicrocomputer.CONFIGURATIONAs can be seen from the block diagram, the PCA4040 consistsof the following hardware.(1) Evaluation chip (M50740-000SP) and peripheral circuit(2) EPROM with the PC4000 monitor program(3) Single-step and breakpoint control circuit(4) Program memory interface circuit(5) Input/output buffer/latch circuitThe board and user system can be connected by means ofan accessory cable.FUNCTION. The debugging machine PC4000 operates as a debuggingmachine for MELPS 740 microcomputers using the monitorprogram contents of a ROM mounted on the dedicatedboard. The evaluation chip (M50740-000SP) loaded on theboard executes the program stored in the program memory.The internal status of the evaluation chip is read out undermonitor CPU control when halted by single-step operationand breakpoint operation.SPECIFICATIONSItemApplicable microcomputerClock frequency iCFApplicable debuggingmachinePower supplyConnection to user'ssystemDebugging functions(contents of monitor EPROM)SpeCificationM50740-XXXSP, M50741-XXXSP4MHzPC4000(connected by a card edge connector J3)Supplied by PC4000Accessory cablee Program execution from any address,stop and single-step operatione Confirmation and change of programRAM contentse Confirmation and modification of RAM datain evaluation chip and verification and modificationof following registers and flags:• Program counter• Index register X• Index register Y• Stack pOinter• Accumulator• Processor status registereOata programing to EPROM and reading7-18 • MITSUBISHI.... ELECTRIC