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MSPM0L2228: What's the meaninig for LCD Display 8x51 and 4x55

Part Number: MSPM0L2228

Tool/software:

Dear expert, 

What's the meaning for LCD display 8x51 and 4x55? 

And how much pin will it use to achieve that? 

Do we have any document to explain this?

Best Regards,

Eric Chen