CS89712-CB View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS89712-CB Datasheet PDF : 170 Pages
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CS89712
Bit
17:18
Description
WRDLEN: This two bit field selects the word length according to the table below.
WRDLEN
00
01
10
11
Word Length
5 bits
6 bits
7 bits
8 bits
Table 54. UBRLCR1-2 UART1-2 (Continued)
3.11 LCD Registers
3.11.1 LCDCON — The LCD Control Register (address 0x8000.02C0)
31
GSMD2
30
GSMD1
29:25
AC prescale
24:19
Pixel prescale
18:13
Line length
12:0
Video buffer size
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.
Bit
0:12
13:18
Description
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.
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
100
DS502PP2
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