Category Archives: electronics

STAX Rp (only BC or DE) in 8085 in microprocessor STA Address (16b) instruction in 8085 ? STA Address (16b) Description – the contents of the accumulator are stored at the memory location specified. Bytes/M-cycles/T-States 3/4/13 Hex code 32 Flags no flags are affected. STAX Rp (only BC or DE) Description – the contents of the accumulator are stored at the memory location pointed to by the register pair. The contents of the accumulator are not affected. Bytes /M-Cycles /T-States 1/2/7                                Register pair Hex codes    02     BC                       12      […]

all about JPE Address (16b) Bytes/m-cycles/t-states in microprocessor 8085 JZ Address , JNZ , LDA ? JPE Address (16b) Description : program execution is transferred to the memory address specified, if parity is even or P = 1. If P = 0, no transfer takes place. Bytes/m-cycles/t-states: 3/2/7, if condition is not true 3/3/10, if condition is not true Hex code : E2 Flags : no flags are affected. JZ Address (16b) Description : program execution is transferred to the memory address specified, if zero or Z = 1. If […]

ANA M , ANI Data (8b) , CNC Address (16b) , CP , CM Address ANA instruction in 8085 ? ANA R Description : The content of the accumulator and the register are logically ANDed and the result is put in the accumulator. Bytes/M-Cycles/T-States : 1/1/4 Hex Codes :                 Register A7         A A0          B A1          C A2          D A3          E A4         H A5        L Flags ; S, Z and P are modified based upon the result of the operation. CY is reset and AC is set. ANA M Description : […]

The 8085 Addressing Modes The instructions MOV B, A or MVI A, 82H are to copy data from a source into a destination. In these instructions, the source can be a register, an input port or an 8 bit number (00H to FFH). Similarly, a destination can be a register or an output port. The sources and destination are operands. The various formats for specifying operands are called the addressing modes. For 8085, they are Immediate addressing Register addressing Direct addressing Indirect addressing Immediate Addressing Data is present in the […]

8085 pin Description Properties control bus is unidirectional or bidirectional . Control Bus Control bus are various lines which have specific functions for coordinating and controlling up operations, e.g., Read/not write line, single binary digit. Control whether memory is being written to (data stored in memory) or read from (data taken out of memory) 1 = read, 0 = write. May also include clock line(s) for timing/synchronising, interrupt, reset etc. typically up has 10 control lines. It cannot function correctly without these vital control signals. The control bus carries control […]

Introduction to 8085 Architecture and Programming Microprocessor The microprocessor is a programming integrated device that has computing and decision – making capability similar to that of the central processing unit (CPU) of a computer. Internal Architecture of 8085 Microprocessor Control unit It generates  signals within up to carry out the instructions, which has been decoded, in reality causes certain connections between blocks of the up to be opened or closed, so that data goes where it is required, and so that ALU operations occur. Arithmetic Logic Unit The ALU performs […]

Ahilbert transformer is a transform has transfer function ,  a hilbert transformer is a which system . Ahilbert transformer is a (a) non-linear system (b) non – causal system (c) time-varying system (d) low-pass system Answer and solution – (a) Hibert transform has transfer function H(0) = – j sgn (0) = {-j = 1 e-j/2, 0 > 0  j = 1 ej/2,  0 < 0 Hence, hilbert transformer is a non-linear system. Unit Exercise – 2 (2 Marks Questions) A continuous time LTI system is described by d2y(t)/dt2 + […]

compute the convolution y(n)=x(n)*h(n) of the following signals , Compute the convolution y[n]* = x[n] * h[n]. when x[n] = (1,2,4), h(n) = {1,1,1,1,1) ? Power spectral density of signal x(t) is shown below. the average power is (a) 0 (b) 6 (c) 0 (d) -6 Find the signal power of x(t) (a) 0.25 W (b) 0.75 W (c) 0.5 W (d) 1 W For the above system G1(s) = s-1/1 + 2s-1 + s-2 Find G2(s) for the given system to be invertible (a) s/1 + 2s + s2 […]

26. The Laplace transform of i(t) is given by i(s) = 2/s(1 + s). as t the value of i(t) tends to (a) 0 (b) 1 (c) 2 (d) 0 The Fourier series expansion of a real periodic signal with fundamental frequency fo is given by gp(t) = c0ej2nft . it is given that c3 = 3 + j5. (a) 5 + j3 (b) -3 – j5 (c) -5 + j3 (d) 3 – j5 Let x(t) be the input to a linear, time-invariant system. the required output is 4x(t […]

trigonometric fourier series of an even function does not have ? answers and solution given in last. Unit Exercise – 1 (1 Mark Questions) The trigonometric Fourier series of an even function does not have the (a) DC term (b) cosine terms (c) sine terms (d) odd harmonic terms If the unit step response of a network is (1 – e-at), then its unit impulse response is (a) ae-at (b) a-1 e-at (c) (1 – a-1) e-at (d) (1 – a) e-at A system is defined by its impulse response […]