Why com and seg control point can not display correctly when using LCD module?
Customer need to consider the two aspects: hardware and software.
1 Hardware: please check VLCD voltage. In general, the reason for VLCD too high or too low is that com and seg port are out of control; When voltage is too high, there may be ghosts; When the voltage is too low, LCD screen voltage is not enough, there will be no light or little light; For R type LCD, SN8P2308 VLCD is connected directly to internal VDD, which do not need an external voltage.
2 Software: clear bank 15 in initial program, when need to light up LCD, user can assign correct value to the register in RAM bank 15. For specific information, please refer to LCD RAM MAP section in datasheet.
1 Hardware: please check VLCD voltage. In general, the reason for VLCD too high or too low is that com and seg port are out of control; When voltage is too high, there may be ghosts; When the voltage is too low, LCD screen voltage is not enough, there will be no light or little light; For R type LCD, SN8P2308 VLCD is connected directly to internal VDD, which do not need an external voltage.
2 Software: clear bank 15 in initial program, when need to light up LCD, user can assign correct value to the register in RAM bank 15. For specific information, please refer to LCD RAM MAP section in datasheet.