mitsubishi - Al Kossow's Bitsavers

"MITSUBISHI MICROCOMPUTERSMELPS 8-41 SLAVE MICROCOMPUTERSFUNCTIONS OF MELPS 8-41 SLAVE MICROCOMPUTERSAffected carryDescriptionC AC NoteInputs contents of Pp to low-order 4 bits of register A and inputs 0 to high-order 4 bits ofregister A.Pp's used for multiplying 8243 ports are P4-Outputs low-order 4 bits of register A to Pp. Correspondence to P2, P1 bits is shownP7.below.P4···P1P2 = 00Logical product of the low-order 4 bits of register A and contents of Pp; Pp contains result. PS···P1P2 = 01Logical sum of low-order 4 bits of register A and contents of Pp; Pp contains result.P6···P1P2 = 10P7···P1P2= 11Transfers contents of timer/event counter to register A.Transfers contents of register A to timer/event counter.Starts timer operation of timer/event counter. Count cycle is 480 times master oscillation.Starts operation as event counter of timer/event counter. Counts up when pin T1 changes from high to low input level.IIStops operation of timer or event counter.Enables interrupt of timer/event counter.Disables interrupt of timer/event counter. Resets interrupt flip-flop of CPU which is set during CPU stand-by. Timer flag is not affected.Enables external interrupt.Disables external interrupt.Selects working register bank O.Selects working register bank 1 .Enables DMA handshaking line.\Enables master interrupt.No operation. Execution time is 1 machine cycle.• MITSUBISHI.... ELECTRIC5-23