LC78711E Datasheet, PDF (36/43 Pages) Sanyo Semicon Device – Graphics Display Processor

29. Register 2Dhex
LC78711E
• Data7: Unused (Must be set to 0.)
Data6: Unused (Must be set to 0.)
Data5: Unused (Must be set to 0.)
Data4: Unused (Must be set to 0.)
• Data3: WSP2
— Function: Data write to sprite pattern 2 setup.
— Operation: Sets up data writes to sprite pattern 2.
WSP2 = 0: Does not set up data writes to sprite pattern 2.
WSP2 = 1: Sets up data writes to sprite pattern 2.
• Data2: WSP1
— Function: Data write to sprite pattern 1 setup
— Operation: Sets up data writes to sprite pattern 1.
WSP1 = 0: Does not set up data writes to sprite pattern 1.
WSP1 = 1: Sets up data writes to sprite pattern 1.
• Data1: SPAI
— Function: Automatic increment setting for the sprite address during sprite data writes
— Operation: Specifies whether or not the sprite address is automatically incremented during sprite data writes.
If automatic incrementing is not specified, the application must specify the address in registers
2Bhex and 2Chex after every data transfer.
SPAI = 0: The address is not automatically incremented.
SPAI = 1: The address is automatically incremented.
• Data0: SPDF
— Function: Setting for the number of data items transferred during sprite data transfers
— Operation: Specifies whether data is transferred in dot units or in two dot units during sprite data transfers.
This is a setting that determines whether only the lower 3 bits or the lower 3 bits and the upper 3 bits
are transferred in register AEhex data transfers.
SPDF = 0: Takes only the lower 3 bits as data.
SPDF = 1: Also process the 3 bits Data6 to Data4 as data.
Here, the lower 3 bits of data are processed as the first data item, and the upper 3 bits
become the data for the next bit map address.
Note: SPDF must be set to 0 when SPAI is set to 0, i.e. when automatic address incrementing is not used.
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