• How much on-board RAM does the P89C669 really have?
    I am using a P89C669 and I am confused about the internal SRAM. The data sheets say there is 2K of on-board static RAM but the user manual shows that only 768 bytes in the on board XDATA space. However...
  • How much on-board RAM does the P89C669 really have?
    I am using a P89C669 and I am confused about the internal SRAM. The data sheets say there is 2K of on-board static RAM but the user manual shows that only 768 bytes in the on board XDATA space. However...
  • Does the NVIC really do interrupt nesting?
    Note: This was originally posted on 23rd February 2011 at http://forums.arm.com For days I've been banging my head with a problem that shouldn't take more than a minute time otherwise. How to get the...
  • 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...
  • Does the NVIC really do interrupt nesting?
    Note: This was originally posted on 23rd February 2011 at http://forums.arm.com For days I've been banging my head with a problem that shouldn't take more than a minute time otherwise. How to get the...