• is there any pull up/down resisters required between MCP23S17 AND ULN2803A ?
    Hi, In one of my design i am using MCP23S17 IC, it is 16 I/O Expander, now i want to interface all pins to ULN2803A IC , Now my question is there any pull up/down resisters required between MCP23S17...
  • PINs current
    hi i m new to microcontrollers and i would like to know that when we make pins as output the IOH voltages are 5V and current is 60 microamp then how the high output can drive a 2SC1815 NPN Transitor...
  • SVCS and Sourcesafe's current project...
    Hi Is there a way to ensure that "Set Current Project" is selected before the next SVCS command is issued? The reason I ask is that if I have two Keil projects open and I forget which project is...
  • In circuit programming
    I have an (external) 512 Kbyte flash using the Harvard model, and an Atmel 89C51 processor. I understand the code must move the boot loader code from flash to RAM for execution. (This assumption based...
  • circuit diagram
    hey i have to give a presentation about the working of microcontroller in train announcement system . i just have a block diagram which has a buzzer,rf cardreader and a voice chip interfaced to 8051...