CS89712 datasheet(100/170 Pages) CIRRUS

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CS89712

100

DS502PP2

3.11 LCD Registers

3.11.1

LCDCON — The LCD Control Register (address 0x8000.02C0)

The LCD control register is a 32-bit read / write register that controls the size of the LCD screen and the operating

mode of the LCD controller. Refer to the system description of the LCD controller for more information on video buff-

er mapping, and for details of how to program the LCD control register for use in Snooze State.

The LCDCON register should only be reprogrammed when the LCD controller is disabled.

17:18

WRDLEN: This two bit field selects the word length according to the table below.

Bit

Description

Table 54. UBRLCR1-2 UART1-2 (Continued)

WRDLEN

Word Length

5 bits

6 bits

7 bits

8 bits

29:25

24:19

18:13

12:0

GSMD2

GSMD1

AC prescale

Pixel prescale

Line length

Video buffer size

Bit

Description

0:12

Video buffer size: The video buffer size field is a 13-bit field that sets the total number of bits x

128 (quad words) in the video display buffer. This is calculated from the formula:

Video buffer size = (Total bits in video buffer / 128) – 1

i.e., for a 640 x 240 LCD and 4 bits-per-pixel, the size of the video buffer is equal to

614400 bits.

Video buffer = 640 x 240 x 4=614400 bits

Video buffer size field = (614400 / 128) – 1 = 4799 or 0x12BF hex.

If Snooze State is to be used with the LCD controller enabled, then the value programmed into

this register should not be less than 3. The minimum value allowed is 3 for this bit field.

13:18

Line length: The line length field is a 6-bit field that sets the number of pixels in one complete

line. This field is calculated from the formula:

line length = (Number of pixels in line / 16) – 1

i.e., for 640 x 240 LCD Line length = (640 / 16) – 1 = 39 or 0x27 hex.

The minimum value that can be programmed into this register is a 1 (i.e., 0 is not a legal value).

Table 55. LCDCON

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