NJU6820 datasheet(21/101 Pages) NJRC

21 / 101 page

NJU6820

- 21 -

In the 16-bit data bus length mode

column-address

7FH

0 H

12bit

row-address

27H

12bit

Fig6

In the B&W mode, only MSB data from each 4-bit display data group in the DDRAM is used. Therefore,

384 x 40 pixels in the B&W and 128 x 40 pixels in the 8-gradation are available.

The range of the column address varies depending on data bus length. The range between 00H and

FFH is used in the 8-bit data bus length and the range between 00H and 7FH is in the 16-bit data bus

length.

The increments for the column address and row address are set to the auto-increment mode by

programming the “AXI” and “AYI” registers of the “Increment control” instruction. In this mode, the

contents of the column address and row address counters automatically increment whenever the

DDRAM is accessed.

The column address and row address counters, independent of the line counter. They are used to

designate the column and row addresses for the display data transferred from MPU. On the other hand,

the line counter is used to generate the line address, and output display data to the segment drivers,

being synchronized with the display control timing of the FLM and CL signals.

NJU6820 Datasheet(PDF) 21 Page - New Japan Radio