UPD161622 datasheet(47/103 Pages) NEC

47 / 103 page

Data Sheet S15649EJ2V0DS

µ PD161622

5.10 Partial Display Mode

The

µ PD161622 is provided with a function that allows sections within the screen to be displayed separately (partial

display mode). The start line of the area to be displayed in partial display mode is set using the partial display area

start line register (R20, R21), the number of lines in the area to be displayed is set using the partial display area line

count register (R22, R23), and the color of the area not to be displayed is set using the partial off area color register

(R19). If ”1” is set in the partial display area line count registers (R22, R23), the partial display areas each become 1

line. If “0” is set, there are no partial display areas but only normal display areas.

The non-display area indicated by R20 and R22 is called Partial 1, and the non-display area indicates by R21 and

R23 is called Partial 2. The Partial 2 setting is enabled only when the Partial 1 setting has been performed (when R22

≠ 0). Therefore, to set only one area as a non-display area, perform only the setting for Partial 1.

Low power consumption cannot be achieved if only the partial mode is set. If low power consumption is required, the

mode must be switched to the 8-clor mode.

Figure 5–26. Partial Display Mode

00H

01H

02H

03H

81H

82H

83H

Section not displayed

...

Display

start line (00H)

Partial display start

line (R20, R21)

Cautions 1. The "scroll step count register (R17)" command is ignored in the partial display mode.

2. The specified partial areas must not directly overlap, and the Partial 1 area and Partial 2 area

must be separated by at least one line. If the areas overlap, only the Partial 1 settings are valid,

and partial display is not performed for the Partial 2 area.

3. When setting the partial display areas, be sure to observe the following relationship.

“00H”

≤ R20 (R21)

R22 (R23)

≤ “AFH”

The following sequence is recommended to avoid display malfunction when switching from normal display mode to

partial display mode and vice versa.

UPD161622 Datenblatt(PDF) 47 Page - NEC