AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 1106

• Manufacturer Part Number: AT91SAM9G45-EKES
• Description: KIT EVAL FOR AT91SAM9G45
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM9G45-EKES

• Contents: Board
• Processor To Be Evaluated: SAM9G45
• Data Bus Width: 32 bit
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 50 C
• Minimum Operating Temperature: - 10 C
• Operating Supply Voltage: 1.8 V to 3.3 V
• For Use With/related Products: AT91SAM9G45
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4626953

1106
AT91SAM9G45
Table 45-11
Table 45-11. Dithering Duty Cycle
The duty cycles for gray levels 0 and 15 are 0 and 1, respectively.
The same DP_i register can be used for the pairs for which the sum of duty cycles is 1 (e.g., 1/7
and 6/7). The dithering pattern for the first pair member is the inversion of the one for the
second.
The DP_i registers contain a series of 4-bit patterns. The (3-m)
pixel with horizontal coordinate x = 4n + m (n is an integer and m ranges from 0 to 3) should be
turned on or off in the current frame. The operation is shown by the examples below.
Consider the pixels a, b, c and d with the horizontal coordinates 4*n+0, 4*n+1, 4*n+2 and 4*n+3,
respectively. The four pixels should be displayed in gray level 9 (duty cycle 3/5) so the register
used is DP3_5 =”1010 0101 1010 0101 1111”.
The output sequence obtained in the data output for monochrome mode is shown in
12.
Table 45-12. Dithering Algorithm for Monochrome Mode
Gray Level
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Frame
Number
N
N+1
N+2
N+3
shows the correspondences between the gray levels and the duty cycle.
Pattern
1010
0101
1010
0101
Duty Cycle
1
6/7
4/5
3/4
5/7
2/3
3/5
4/7
1/2
3/7
2/5
1/3
1/4
1/5
1/7
0
Pixel a
ON
OFF
ON
OFF
Pixel b
OFF
ON
OFF
ON
th
bit of the pattern determines if a
Pattern Register
-
DP6_7
DP4_5
DP3_4
DP5_7
DP2_3
DP3_5
DP4_7
~DP1_2
~DP4_7
~DP3_5
~DP2_3
~DP3_4
~DP4_5
~DP6_7
-
Pixel c
ON
OFF
ON
OFF
6438F–ATARM–21-Jun-10
Pixel d
OFF
ON
OFF
ON
Table 45-