• XTAL Oscillator
    It is said that 8051 has an on-chip oscillator but requires external clock to run it. What may be the internal circuit for on-chip oscillator, how it runs after connecting crystal oscillator? Also what...
  • access to Xtal value in program
    hello i look to some way for access Xtal value in my program . when i start new project in keil , in "Options for Target..." window i add Xtal Frequency in hertz . (it is 18.432 for at91sam usually...
  • RS232 & MAX232 serial communication
    Iam connecting microcontroller 8051 with my PC COM1 port to have serial communication. To have same voltage levels between PC and 8051 i have used MAX232 but i need to know what other components like...
  • rs232 serial communication
    Hello I need to communicate gsm module. as it use asci AT commands I ask if I can connect the modems serial port directly to the microcontroller such as 89s51/8051 or I need interface?
  • What does the XTAL directive really mean?
    I am confused by the documentation. It states in the "Getting Started" book that the XTAL [directive in the Target dialog] specifies the CPU clock for my device. "In most cases this value is inentical...