mitsubishi - Al Kossow's Bitsavers

MITSUBISHI MICROCOMPUTERSMSL8243PINPUT/OUTPUT EXPANDERDESCRIPTIONThe M5L8243P is an input/output expander fabricated usingN-channel silicon-gate, EO-MOS technology. This device isdesigned specifically to provide' a low-cost means of I/Oexpansion for the MELPS 8-48 single-chip microcomputersand MELPS 8-41 slave microcomputers.FEATURES• 16 Input/output pins (l oL = 5.0mA( max.))• Simple interface to MELPS 8-48, MELPS 8-41• Single 5V -power supply• Low power dissipation .............................. 50mW(typ.)• Interchangeable with i8243 in pin configuration and electricalcharacteristicsAPPLICATIONI/O expansion for the MELPS 8-48 single-chip microcomputersand MELPS 8-41 slave microcomputers.PIN CONFIGURATION (TOP VIEW)INPUTI0pUJ~~X P50 - 1INPUTI I P4 o - 2OUTPUT P4, - 3PORT4 P4 2- 4P43 - 5CHIP SELECT CS -+ 6PROGRAM PROG -+ 7INPUrl I3 - 8OUTPUT P22 - 9PORT 2 P2, _ 10P2o - 11(OV) GNDOutline 24P4Vee (5V)FUNCTIONThe M5L8243P is designed to provide a low-cost means ofI/O expansion for the MELPS 8-41 and the MELPS 8-48.The M5L8243P consists of four 4-bit bidirectional static I/Oports and one 4-bit port which serves as an interface to theMELPS 8-41 and MELPS 8-48. Thus multiple M5L8243Ps canbe added to a single master. Using the original instructionset of the master, the M5L8243P serves as the in resident 1/o facility. Its I/O ports are accessed by instructions MOVO,ANLO and ORLO.BLOCK DIAGRAMPORT 2CHIP SELECT PROGRAM~CS PROG1-------6 7--.--~I ,I ,4BUS44ANDIORLOGICANDIORLOGICLATCH. LATCHLATCHLATCH1,l_P7 0 P7, P7 2 P7 3'----v-----'PORT?P6 0 P6, P6 2 P6 3 P5 0 P5, P5 2 P5 3~ '----.------'PORTS PORT 5P4 0 P4, P4 2 P4 3'-v----'PORT 46-26•. MITSUBISHI"ELECTRIC