6.6 Read from Address (ReadFromAddress) Pseudo Operation

oData = ReadFromAddress (address)

• To send 32 bits of data to the device memory.

• The 32-bit data is read from the memory at the address specified in the address parameter.

• The device must be in Debug mode.

• The following is an example of how to use the ReadFromAddress function for PIC32MX, PIC32MZ and PIC32MK devices:

  ReadFromAddress (address)
  {
  // Load Fast Data register address to s3
  instruction = 0x3c130000;
  instruction |= (0xff200000>>16)&0x0000ffff;
  XferInstruction(instruction); // lui s3, <FAST_DATA_REG_ADDRESS(31:16)> - set address of fast
  data register
  // Load memory address to be read into t0
  instruction = 0x3c080000;
  instruction |= (address>>16)&0x0000ffff;
  XferInstruction(instruction); // lui t0, <DATA_ADDRESS(31:16)> - set address of data
  instruction = 0x35080000;
  instruction |= (address&0x0000ffff);
  XferInstruction(instruction); // ori t0, <DATA_ADDRESS(15:0)> - set address of data
  // Read data
  XferInstruction(0x8d090000); // lw t1, 0(t0)
  // Store data into Fast Data register
  XferInstruction(0xae690000); // sw t1, 0(s3) - store data to fast data register
  XferInstruction(0); // nop
  // Shift out the data
  SendCommand(ETAP_FASTDATA);
  oData = XferFastData(32'h0x00000000);
  return oData;
  }