mitsubishi - Al Kossow's Bitsavers

-----------------~MITSU~ISHI MICROCOMPUTERSM5L8156P2048-BIT STATIC RAM WITH I/O PORTS AND TIMERTable 7 Format of counter/timer Mode 1: Outputs square wave signals as in mode 0Mode 2: Outputs a low-level pulse during the finalBit NumberAddressFunctioncount down~T-54 ,l"01--Mode 3: Outputs a low-level pulse during each final+,;:THE LOW-ORDER 8 BITSXXXXX100count down;~, ;':~r T'~ OF THE COUNTER REGISTER------Starting and stopping the counter/timer is controlled byM1,M2 TIMER MODEbits 6 and 7 of the command register (see Table 2 forXXXXX101~~ T"i:" T~ T,THE HIGH-ORDER 6 BITSdetails) . The format and timer modes of the counter/timerTs-T13 OF THE COUNTER REGISTERregister are shown -in Table 7 and Table 8.Table 8 Timer modeThe counter/timer is not influenced by a reset, but countingis discontinued. To resume counting, a start command mustTimer operationbe written into the command register as shown in Table 2.o oWhile operating 2n + 1 count down in mode 0, a high-levelOutputs high-level Signal during the former half of the counter operationOutputs low-level signal dUring the tatter halt of the counter operationsignal is output during the n+ 1 counting and a low-level signal(mode 0)is output during the n counting.Outputs square wave signals as in mode 0 (mode 1)oo-------------------Outputs a low-level pulse during the final count dowm(mode 2)------------------Outputs a low-level pulse during each final count downABSOLUTE MAXIMUM RATINGS(mode 3)Symbol Parameter ConditionsVee Supply voltageVI Input voltage With respect to vssVa Output voltagePd Maximum power dissipation Ta=25°CTopr Operating fre~-air temperature range ,Tstg Storage temperature rangeLimitsUnit-0.5-7 V-0.5-7 V-0.5-7 V1.5 W0-70 'c-65-150 'cRECOMMENDED OPERATING CONDITIONS (Ta=0-70'C, unless otherwise noted)LimitsSymbol Parameter UnitMin Nom MaxVee Supply voltage 4.75 5 5.25 VVss Power-supply voltage 0 Vt----V IL Low-level input voltage -0.5 0.8 VV IH High-level input voltage 2 Vcc+O.5 VELECTRICAL CHARACTERISTICS (Ta=0-70'C, Vcc=5V+5%, unless otherwise noted)SymbolParameterTest conditionsMinLimitsTypMaxUnitV OHHigh-level output voltageVss=OV, IOH=-400~A2.4VVOLLow-level output voltageVss=OV, 10L =2mA0.45 VIIInput leak currentVsS=OV,VI=O-VCC-1010 /-LAII(eE)Input leak current, CE pinVss=OV, VI=O-VCC-100100 /-LA102Output floating leak currentVss=OV, VI=O. 45-Vcc-1010 /-LACiInput capacitanceVIL =OV, f=l MHz, 25mVrms, T a=25°C10 pFCi/oInput/output terminal capacitanceVI/OL =OV, f=l MHz, 25mVrms, T a=25°C20 pFleeSupply current from VccVss=OV180 rnANote 1Current flowing into an IC is positive, out is negative.• MITSUBISHI.... ELECTRIC6-51