SBN1661G_M18 Datasheet, PDF (29/52 Pages) List of Unclassifed Manufacturers – Dot-matrix STN LCD Driver with 32-row x 80-column Display Data Memory

Avant Electronics SBN1661G_M18, SBN1661G_M02, SBN0080G_S18, SBN0080G_S02
Dot-matrix STN LCD Driver with 32-row x 80-column
8.3 Read-Modify-Write
When the Read-Modify-Write command is issued, the SBN1661G_X enters into Read-Modify-Write mode.
In normal operation, when a Read Display Data command or a Write Display Data command is issued, the content of the
Column Address Register is automatically incremented by one after the command operation is finished. However, during
Read-Modify-Write mode, the content of the Column Address Register is not incremented by one after a Read Display
Data command is finished; only the Write Display Data command can make the content of the Column Address Register
automatically incremented by one after the command operation is finished.
During Read-Modify-Write mode, any other registers, except the Column Address Register, can be modified. This
command is useful when a block of the Display Data Memory needs to be repeatedly read and updated.
Fig. 17 gives the change sequence of the Column Address Register during Read-Modify-Write mode. Figure 18 gives
the flow chart for Read-Modify-Write command.
Read-Modify-Write command issued.
Column Address
N
Read-Modify-Write duration
N+1 N+2 N+3
END command issued.
N+m
N
Internal Buffer Register _{Re-load column address by issuing the END command}
Fig.17 Column address change during Read-Modify-Write
2006 Aug 16
29 of 52
data sheet (v6.3)