• RS232 replecement with NOT gates
    Hi my friends.. I have some trouble with my project. I try to communication microcontroller AT89C51 with computers. I didn't use rs 232, but I replacement with NOT gates. sometimes run and sometimes...
  • Problems with Timer1 and 2 of SAB80C535
    Morning, I have some stupid troubles with my SAB80C535 µP. I'm trying to read a acceleration sensor ( ADXL202JE ) with timer 1 and 2. It works aproximatily fine, excepting the "turbulent" resolution...
  • Looking for a good 8051 microcontroller.
    I've been planning on using the DS87C520 microcontroller. I really like this chip. Its got 1024 bytes of on-chip XDATA RAM and 16KB or on-chip CODE EPROM. However, I'm running out of room. Does anyone...
  • external interrupts
    Hi, i wanna know how to make an external interrupt from falling edge to rising edge, the example on the keil site only works with falling edge.. how can i do that ?
  • Looking for efficiency
    I am using small memory model and I need to write data to an absolute memory location (0xC002), so I'm using the MVAR macro: #define DISPLAY_DATA MVAR(unsigned char, 0xC002) void main(void) { DISPLAY_DATA...