NT7502 Ver la hoja de datos (PDF) - Novatek Microelectronics

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NT7502

65 X 132 RAM-Map LCD Controller / Driver

Novatek Microelectronics 

NT7502

The Page Address Circuit

As shown in Figure 4, page address of the display data RAM is specified through the Page Address Set Command. The page

address must be specified again when changing pages to perform access.

Page address8 (D3, D2, D1, D0 = 1, 0, 0, 0,) is the page for the RAM region used; only display data D0 is used.

The Column Address

As shown in Figure 4, the display data RAM column address is specified by the Column Address Set command. The specified

column address is incremented (+1) with each display data read / write command. This allows the MPU display data to be

accessed continuously. Moreover, the incrimination of column addresses stops with 83H, because the column address is

independent of the page address. Thus, when moving, for example, from page0 column 83H to page 1 column 00H, it is

necessary to respecify both the page address and the column address.

Furthermore, as is shown in Table 4, the ADC command (segment driver direction select command) can be used to reverse the

relationship between the display data RAM column address and the segment output. Because of this, the constraints on the IC

layout can be minimized when the LCD module is assembled.

Table. 4

SEG Output

ADC “0”

(ADC) “1”

SEG0

0 (H)$

83 (H)%

Column Address

Column Address

SEG131

$83 (H)

%0 (H)

The Line Address Circuit

The line address circuit, as shown in Table 4, specifies the line address relating to the COM output when the contents of the

display data RAM are displayed. Using the display start line address set command, what is normally the top line of the display

can be specified. This is the COM0 output when the common output mode is normal, and the COM63 output for NT7502, when

the common output mode is reversed. The display area is a 65-line area for the NT7502 from the display start line address.

If the line addresses are changed dynamically using the display start line address set command, screen scrolling, page

swapping, etc. can be performed.

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