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AN.No.G1216B1N000-3D0E
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(4) Display start line register
The display start line register is a register which determines the line address (see Figure 6) for which
data is displayed on the top line of the LCD screen when displaying the contents of the display data
RAM on the LCD screen. It is also used to scroll the display. The 6 bit (0 to 63) display start line
information is written in this register by the Display Start Line Set Instruction.
The contents of this register are transmitted to address counter Z at “H” level of the FRM signal
(common driver output) which indicates the display start on the screen.
(5) Z-address counter
The Z-address counter generates the address to output the display data synchronized with the
common signal. This is a 6-bit counter which counts at the fall of the CL signal (common driver output).
The contents of the display start line register are preset to the Z-address counter at “H” level of the
FRM signal (common driver output).
(6) Display data RAM
The display data RAM is a RAM that stores the display dot data. 1 bit of RAM data corresponds to
lighting (data=1) or non-lighting (data = 0) of 1 dot of the display on the LCD screen. Figure 6 shows
the relationship between the address and data inside the RAM on either the right or left screen (64 64
dots). In this case, the display start line is 0.