Selection of maximum 48 segment/common lines from 52 LCD pins.
There are 52 LCD pins (LPx) from which up to 48 LCD pins can be enabled or disabled individually according to the LCD glass. Each LCD pin can be configured as front plane (SEG) or back plane (COM), offering various configurations. For 1/4 duty settings the maximum number of SEG lines and COM lines are 4 and 44 respectively. For the other duty configuration, this is mentioned in the device datasheet.
Write a '1' to a bit in LPENL or LPENH registers will enable the corresponding LCD pin.
- For LP[31:0], write to LCD Pin Enable Low register bits LPENL[31:0]
- For LP[51:32], write to LCD Pin Enable High register bits LPENH[18:0]
Writing a '0' to a bit in LPENL or LPENH registers will disable the corresponding LCD pin.
- LCD pins can be enabled individually. LCD pins need not be enabled in a contiguous manner.
- A disabled LCD pin can thus be used as GPIO or any other alternate function
- The number of LCD pins enabled should not be higher than the maximum of COM and SEG lines supported
The assignment of the COM and SEG lines are always in ascending order. According to their duty configuration COM lines are assigned first to the LCD pins enabled. The number of SEG lines enabled is thus the number of LCD pins enabled minus the number of COM lines assigned.
