• Re: Connection of 8031 , 27c512 and 82c55
    Hi, In one of my project i connected 8031, 27c256 and 8255.Here the A15 line is given common to Chip enable of EPROM and also connected to G1-pin of address decoder via a NAND gate. So if the...
  • Need two 89C51RE2SLSUM MCUs!
    We are redoing an 87C51FB design with the 87C51MC2, which is readilly available from DigiKey. The problem is, the -MC2 is an OTP part, and we have a lot of code development to do yet. This is going to...
  • Problems using two programs
    I have created two separate programs for my AT89C51ED2: bootloader (0x0000) and normal program (0x2000). I use an absolute memory addressed variable to distinguish between the two modes of operation so...
  • I need to access two memory of xdata
    Hi, I have two memory (Flash & NVRAM). I need to access both memories. I am writing program in C. If I want to store some variables in NVRAM and some in Flash how do I do it? Is there any mechanism...
  • Need explination of these two decloration software lines
    What do the following lines do? Generaly not specificaly. What do the terms mean/and or do? 1) xdata * xdata mean? 2) s_pSIN = (MASTER_2_AFPU*)&s_SIN; static xdata uchar s_SIN[sizeof(MASTER_2_AFPU...