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  1. V

    decoder for 8051

    look at following handy example 8 bit Instruction set first 4 bit for Alu function last 4 bit for register A=address register 4bit I=instruction register 4bit R1= register 4 bit R2= register 4 bit alu function AIR1R2 ALU_NOP 4'b0000 XXXX ALU_ADD 4'b0001...
  2. V

    decoder for 8051

    can anyone tell me which decoder is used for 8051 microcontroller ? 4 bits can decode 16 things. 5 bits can decode to 32 things, 6 bits can decode 64 things. 8 bit can decode 256 things 16 bit can decode 65536 things etc, etc.. suppose I am using 16 bit input ,ram_rd_sel ,ram_wr_sel...
  3. V

    nor gate cmos circuit

    ok thanks lot I have question I made that circuit on proteus software can I use proteus to simulate that circuit ?
  4. V

    nor gate cmos circuit

    ok thank you very much some specification for cmos nor gate .*dc supply voltage * dc input voltage *dc output voltage *dc input current *dc output current * power dissipation ok If we have two known value then we can determine another value example If we know voltage and resistance then we...
  5. V

    nor gate cmos circuit

    If pmos =6/1 then nmos will be 3/1 according to your formula W/L(PMOS)=4*W/L(NMOS). pmos = 6/1 and nmos = 6/2 *4=12/1 circuit is here
  6. V

    nor gate cmos circuit

    hello I made Nor gate with coms transistor please check the connection If my diagram is correct then I want to decide length and width of transistor ? still I have not decide width and length I just want to confirm that my diagram is correct ?
  7. V

    Procedural Assignment error (verilog )

    when i compile code I am getting following error line if (ld==1) q4 <= d4; Error (10137): Verilog HDL Procedural Assignment error at core_v.v(70): object "q4" on left-hand side of assignment must have a variable data type module core_v(clk,ld,d0, q0,d1,d2,q1,q2,a,b,z,sel,d,q,d3,q3,d4,q4 )...
  8. V

    8051 specification

    specification 2 bit microcontroller 2 bit data 2bit instruction 2bit decoder 4 bit program counter I am taking small example to understand I am dealing with 2 bit data 1bit for opcode 1bit for operand I am using 2:1 decoder It can address 4 address line
  9. V

    8051 specification

    hello, I have doubt about 8051 specification 8 bit microcontroller 8 bit data 8 bit instruction 8 bit decoder 16 bit program counter 8 bit data If we want to deal with 8 bit data so we use 8 bit 8 bit instruction if instruction is 8 bit then we can do 256 operation (and.or.addition ....upto...
  10. V

    algorithm for micro controller

    hello experts I want to write verilog code for microcontroller (8051) I have done little homework designing controller is not easy so I have divided my homework first I have developed algorithem (algorithm ) Design for microcontroller Verilog code What is Input for microcontroller What is...
  11. V

    LED blinking with switch

    now I have reduced value of r1
  12. V

    LED blinking with switch

    I have compiled this code there is two error I tried your code. there is no error but still LED is not blinking I corrected my circuit and then I burned code
  13. V

    LED blinking with switch

    No actually I am doing all by myself I want to learn something by doing some practical my target First I have decided I will make simple project (for LED, SWITCH,MOTOR,SEVEN SEGMENT DISPLAY ) I will make diagram. then I will write assembly code , then I will write c code. first I will write...
  14. V

    LED blinking with switch

    I am trying to blink led with switch I have one switch and one LED. switch is connected to port pin PO.0 LED is connected to port pin P1.0 if switch is on then LED is on if switch is of then LED is of assembly code org 0h ON: setb P1.0 ; led on setb P0.0...
  15. V

    blink led

    now the led is blinking for very short time thank you very much for your help
  16. V

    blink led

    you mean this type
  17. V

    blink led

    I want to blink led for some time I made diagram using proteus component AT89C51 crystal LED diagram assembly code org 00h Setb P1.0 ; Led on clr P1.0 ; Led off delay: mov R1, #20 mov R2, #0 delay1: djnz R2...
  18. V

    how to write input and output for microcontroller ?

    look at this example what is meaning of ifdef and endif ? module oc8051_top (wb_rst_i, wb_clk_i, //interface to instruction rom wbi_adr_o, wbi_dat_i, wbi_stb_o, wbi_ack_i, wbi_cyc_o, wbi_err_i, //interface to data ram wbd_dat_i, wbd_dat_o, wbd_adr_o, wbd_we_o...
  19. V

    how to write input and output for microcontroller ?

    hello experts I want to write input and output for microcontroller in verilog langugae I have tried to write code Microcontroller has following function · ALU · Decoder · Port · Counter · Interrupt · Accumulator · Stack pointer · Data pointer · Special function register ·...
  20. V

    verilog code need help

    Instruction format 0 0 0 do AND logic 000 xxx AND XXX 0 0 1 do OR logic 001xxx ORxxx 0 1 0 do Nand logic 010xxx NANDxxx 0 1 1 do nor logic 011xxx norxxx 1 0 0 do Xor logic 100xxx norxxx 1 0 1 do X nor 101xxx Xorxxx 1 1 0 do addition 110xxx Addxxx 1 1 1 do subtraction 111xxx...
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