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參數(shù)資料
| 型號： | CL-PS7111-VC-A |
| 廠商： | CIRRUS LOGIC INC |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Low-Power System-on-a-Chip |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP208 |
| 封裝： | VQFP-208 |
| 文件頁數(shù)： | 62/105頁 |
| 文件大?。?/td> | 1207K |
| 代理商： | CL-PS7111-VC-A |
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September 1997
61
PRELIMINARY DATA BOOK v2.0
REGISTER DESCRIPTIONS
CL-PS7111
Low-Power System-on-a-Chip
24:19
Pixel Prescale:
The pixel prescale field is a 6-bit field that sets the pixel rate prescale. The pixel rate is derived from a
36.864-MHz clock and is calculated with
Equation 5-2
.
Pixel rate (MHz) = 36.864
÷
(pixel prescale + 1)
Equation 5-2
The pixel rate should be chosen to give a complete screen refresh frequency of approximately 70 Hz to avoid flicker.
Frequencies above 70 Hz should be avoided as they consume additional power. The pixel prescale value can be
expressed in terms of the LCD size by using
Equation 5-3
.
Pixel prescale = (526628
÷
Total pixels in display)
1
Equation 5-3
The value should be rounded down to the nearest whole number. ‘0’ is illegal and results in no pixel clock.
For example:
A 640
×
240 LCD, pixel prescale = 526628
÷
(640
×
240)
1 = 2.428 (2)
Equation 5-4
Equation 5-4
gives an actual pixel rate of 36.864E6
÷
2 + 1 = 12.288 MHz, which gives an actual refresh frequency of
12.288E6
÷
(640
×
240) = 80 Hz.
NOTE:
As the CL2 low pulse time is doubled after every CL1 high pulse (see
Figure 6-8 on page 86
), this refresh fre-
quency is only an approximation; the accurate formula is shown in
Equation 5-5
.
12.288E6
÷
((640
×
240) + 120) = 79.937 Hz.
Equation 5-5
18:13
Line Length:
The line length field is a 6-bit field that sets the number of pixels in one complete line. This field is calcu-
lated with
Equation 5-6
.
Line length = (No. pixels in line
÷
16) - 1
Equation 5-6
For example, for 640
×
240 LCD Line length = (640
÷
16)
1 = 39 or 0x27 h.
NOTE:
The minimum value that can be programmed into this register is ‘1’ (that is, ‘0’ is not a legal value).
12:0
Video Buffer Size:
The video buffer size field is a 13-bit field that sets the total number of bits
×
128 (quad words) in
the video display buffer. This is calculated with
Equation 5-7
.
Video buffer size = (Total bits in video buffer / 128) - 1
Equation 5-7
For example, for a 640
×
240 LCD and 4 bits per pixel the size of the video buffer = 640
×
240
×
4 = 614400 bits
Video buffer size field = (614400
÷
128)
1 = 4799 or 0x12BF h.
Equation 5-8
Bit
Description
(cont.)
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