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LCD Driver based on the HT1621 Controller

barry gordon
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Having a problem understanding controller. The ram mapping in the spec shows a 5-bit segment (address) and 4-bit common (data). The data is 1-to-1 mapping to the common bits. The timing diagram shows these two fields being clocked to the controller. The two fields make up the address which is mapped to the segment/col pins of the LCD.

My LCD has 18-segment plus 4-commons. Segment 9, common 2 would form an address of 010010 and data of 0100.

   But how is a data item set for this memory/address location?

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    Oohs,

    Segment 9, common 2 would form an:
  address of  001001
  and data of   0010

The data stream would be
    101 001001 0010
     ^     ^     ^
     |     |    Data
     |   Mem Addr
  Write ID

    So how would you set/clear a bit for this location?

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  • 0 Offline

    Oohs,

    Segment 9, common 2 would form an:
  address of  001001
  and data of   0010

The data stream would be
    101 001001 0010
     ^     ^     ^
     |     |    Data
     |   Mem Addr
  Write ID

    So how would you set/clear a bit for this location?

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