hello everyone; i have a doubts, when i operate an lcd. when i change my screen to another with key press on lcd, sometimes screen shows black spots on lcd indicating a garbage. why is it happening? is any interrupt is affecting my lcd operation or is there is any issue with bank selection. i have 2 interrutps one is onesecinterrupt which i use on bank zero.onesec is used to display the values entered by user and another is 4msec which is on bank 1. 4msesc is used to refresh the screen pls help me. thank you good day