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INPUT AND OUTPUT (1/0) DEVICES

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INPUT AND OUTPUT (1/0) DEVICES Input/Output devices are the means through which the MPU communicates with "the outside world." The MPU accepts binary data as input from devices such as keyboards and analog-to-digital (A/D) converters and sends data to output devices such as LEDs or printers. There are two different methods b which an MPU can identify I/O devices :one uses an 8-bit address and the other a 16- bit address These methods are described briefly in the following sections. I/Os with 8-Bit Addresses (Peripheral-Mapped I/O) In this type of I/O, the MPU uses eight address lines to identify an input or an output device; this is also known as peripheral-mapped I/O .The eight address lines can have 256 (28 combinations) a dresses ;thus the MPU can identify 256 input devices and 256 output devices with addresses ranging from 00 H to FF H · The input and output devices are differentiated by the control signals I/O Read for input devices and I/O Write for output device...
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Module4 8086 Microprocessor and Peripherals part2 .

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4.2.1 Programming for Stack Program 4.1 WAP to calculate squares of BCD numbers 0 to 9 and store them from 2000h offset onwards in the current data segment. The numbers and their squares are in the BCD format. Write a subroutine for the calculation of the square of a number. ASSUME CS:CODE,DS:DATA,SS:STACK DATA SEGMENT ORG 2000H SQUARES DB 0FH DUP (?) DATA ENDS STACK SEGMENT STACKDATA DB 100H DUP (?) ;Reserve 256 bytes for stack STACK ENDS CODE SEGMENT START: MOV AX,DATA ;Initialize data segment MOV DS,AX MOV AX,STACK ;Initialize stack segment MOV SS,AX MOV SP,OFFSET STACKDATA ; Initialize stack pointer MOV CL,0AH                  ; Initialize counter for numbers MOV SI,OFFSET SQUARES; Pointer for array of squares MOV AL,00H             ; Start from zero NEXTNUM: CALL SQUARE...
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8089 I/O Processor

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8089 I/O Processor 1. Dra w the pin connection diagram of 8089. Ans. The pin connection diagram of 8089 is shown in Fig. 19c.1. 2. Dra w the functional block diagram of 8089. Ans. The functional block diagram of 8089 is shown in Fig. 19c.2. 3. Writ e down the characteristic features of 8089. Ans. The characteristic features of 8089 are as follows: z Very high speed DMA capability—I/O to memory, memory to I/O, memory to memory and I/O to I/O. z 1 MB address capability. z iAPX 86, 88 compatible. z Supports local mode and remote mode I/O processing. z Allows mixed interface of 8-and 16-bit peripherals, to 8-and 16-bit processor buses. z Multibus compatible system interface. z Memory based communications with CPU. z Flexible, intelligent DMA functions, including translation, search, word assembly/ disassembly. z Supports two I/O channels. 4. Indicat e the data transfer rate of 8089 IOP. Ans. On each of the two channels of 8089, data can be transferred ...
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