TLC5941:A total of 16 outputs ,I only used 15 outputs.I have added an external pull-up resistor in this XERR pin .But XERR is always output low. Then I am tryiing setting the XLAT pin. When XLAT is High ,XERR is always output High .I don't know what went wrong. Is the program wrong or is the hardware wrong? I don't know what to do now.The following is the schematic.