By S.K. Sen
Each one bankruptcy of this name starts with ordinary fabrics in regards to the bankruptcy and in this case resulting in the extra complicated questions. various questions about strong many variety of peripheral ICs, used besides microprocessors, were completely mentioned. the second one version contains questions about 8086 microprocessor and the corresponding peripheral ICs. Rs-232C, IEEE-488, USB and USART also are incorporated for completeness of the booklet.
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Additional resources for Understanding 8085 8086 Microprocessor and Peripheral ICs: (Through Question & Answer)
Ans. 1 D Q Call 2400H Trap Input CLR Q Reset in Trap acknowledge Fig. 1: The TRAP interrupt circuit The positive edge of the TRAP signal sets the D F/F, so that Q becomes 1. It thus enables the AND gate, but the AND gate will output a 1 for a sustained high level at the TRAP input. In that case the subroutine written at vector memory location 2400H corresponding to TRAP interrupt starts executing. 2400H is the starting address of an interrupt service routine for TRAP. 8085 Interrupts 37 There are two ways to clear the TRAP interrupt: 1.
Initially, D register is stored with 0A H—the number of data to be compared. The flowchart and the corresponding program are shown below: 21. Ten number 8-bit data are stored starting from memory location 2100 H. Transfer this entire block of data to memory location starting from 3100 H. Ans. B register is used here as a counter which stores the number of data bytes to be transferred.
5 Serial input data Interrupt enable flag 1 = enable 0 = disable Pending interrupts 1 = pending Interrupt masks 1 = masked 0 = unmasked Fig. 5: The RIM instruction format When RIM instruction is executed in software, the status of SID, pending interrupts and interrupt masks are loaded into the accumulator. Thus their status can be monitored. It may so happen that when one interrupt is being serviced, other interrupt(s) may occur. The status of these pending interrupts can be monitored by the RIM instruction.
Understanding 8085 8086 Microprocessor and Peripheral ICs: (Through Question & Answer) by S.K. Sen