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14. Dot Matrix LCD Controller (H8/3854 Group)
Read-Modify-Write Mode
In the normal state, the X or Y address is incremented after both read and write accesses to the
display memory. In read-modify-write mode, the address is incremented only after a write, and
remains the same after a read. By using this mode, it is possible to read previously written data,
process that data, and then write it back to the same address.
Rev.3.00 Jul. 19, 2007 page 394 of 532
REJ09B0397-0300
START
Set address
Read data
Write data
No
End of modification?
Figure 14.8 Read-Modify-Write Mode Flowchart
(Address) + 1
Yes
END
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