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參數(shù)資料

型號：	EP7209
廠商：	Cirrus Logic, Inc.
英文描述：	Ultra-Low-Power Audio Decoder System-on-Chip
中文描述：	超低功耗音頻解碼器系統(tǒng)級芯片
文件頁數(shù)：	78/128頁
文件大?。?/td>	1382K
代理商：	EP7209

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EP7209

DS453PP2

5.10.2

PALLSW Least Significant Word

—

LCD Palette Register

ADDRESS: 0x8000.0580

The least and most significant word LCD palette registers make up a 64-bit read/write register which

maps the logical pixel value to a physical gray scale level. The 64-bit register is made up of 16 x 4-bit

nibbles, each nibble defines the gray scale level associated with the appropriate pixel value. If the

LCD controller is operating in two bits per pixel, only the lower 4 nibbles are valid (D[15:0] in the least

significant word). Similarly, one bit per pixel means only the lower 2 nibbles are valid (D[7:0]) in the

least significant word.

5.10.3

PALMSW Most Significant Word

—

LCD Palette Register

ADDRESS: 0x8000.0540

The pixel to gray scale level assignments and the actual physical color and pixel duty ratio for the gray

scale values are shown in

Table 46

. Note that colors 8

–

15 are the inverse of colors 7

–

0 respectively.

This means that colors 7 and 8 are identical. Therefore, in reality only 15 gray scales available, not

16. The steps in the gray scale are non-linear, but have been chosen to give a close approximation

to perceived linear gray scales. The is due to the eye being more sensitive to changes in gray level

close to 50% gray (See

PALLSW

description).

25:29

AC prescale

: The AC prescale field is a 5-bit number that sets the LCD AC bias frequency. This

frequency is the required AC bias frequency for a given manufacturer

’

s LCD plate. This fre-

quency is derived from the frequency of the line clock (CL[1]). The LCD M signal will toggle after

n+1 counts of the line clock (CL[1]) where n is the number programmed into the AC prescale

field. This number must be chosen to match the manufacturer

’

s recommendation. This is nor-

mally 13, but must not be exactly divisible by the number of lines in the display.

GSEN

: Gray scale enable bit. Setting this bit enables gray scale output to the LCD. When this bit

is cleared each bit in the video map directly corresponds to a pixel in the display.

GSMD

: Gray scale mode bit. Clearing this bit sets the controller to 2-bits per pixel (4 gray scales),

setting it sets it to 4 bits per pixel (16 gray scales). This bit has no effect if GSEN is cleared.