SH7721 datasheet(942/1524 Pages) RENESAS

942 / 1524 page

Section 26

LCD Controller (LCDC)

Rev. 3.00 Jan. 18, 2008 Page 880 of 1458

REJ09B0033-0300

26.3.10

LCDC Horizontal Character Number Register (LDHCNR)

LDHCNR specifies the LCD module's horizontal size (in the scan direction) and the entire scan

width including the horizontal retrace period.

Bit

Bit Name Initial Value R/W

Description

HDCN7

HDCN6

HDCN5

HDCN4

HDCN3

HDCN2

HDCN1

HDCN0

R/W

Horizontal Display Character Number

Set the number of horizontal display characters (unit:

character = 8 dots).

Specify to the value of (the number of display

characters) -1.

Example: For a LCD module with a width of 640 pixels.

HDCN = (640/8) -1 = 79 = H'4F

HTCN7

HTCN6

HTCN5

HTCN4

HTCN3

HTCN2

HTCN1

HTCN0

R/W

Horizontal Total Character Number

Set the number of total horizontal characters (unit:

character = 8 dots).

Specify to the value of (the number of total characters) -

However, the minimum horizontal retrace period is three

characters (24 dots).

Example: For a LCD module with a width of 640 pixels.

HTCN = [(640/8)-1] +3 = 82 = H'52

In this case, the number of total horizontal dots

is 664 dots and the horizontal retrace period is

24 dots.

Notes: 1. The values set in HDCN and HTCN must satisfy the relationship of HTCN

≥ HDCN.

2. Set HDCN according to the display resolution as follows:

1 bpp: (multiplex of 16)

− 1 [1 line is multiplex of 128 pixel]

2 bpp: (multiplex of 8)

− 1 [1 line is multiplex of 64 pixel]

4 bpp: (multiplex of 4)

− 1 [1 line is multiplex of 32 pixel]

6 bpp/8 bpp: (multiplex of 2)

− 1 [1 line is multiplex of 16 pixel]

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