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| 型號： | MC44007 |
| 廠商： | Motorola, Inc. |
| 英文描述： | CHROMA 4 VIDEO PROCESSOR |
| 中文描述： | 色度4視頻處理器 |
| 文件頁數(shù)： | 38/40頁 |
| 文件大?。?/td> | 491K |
| 代理商： | MC44007 |
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MC44002 MC44007
38
MOTOROLA ANALOG IC DEVICE DATA
APPENDIX B – I2C BUS AND RGB CONTROL LOOPS WITH MC44002/7
The RGB drive DACs cannot be buffered on account of the
chip area that this would take up. This factor has
considerable implications on the way that the I2C data is
written into the MC44002/7 memory. If the data for
Brightness, Contrast, Saturation and Hue are transmitted at
just any time, a disturbance will be visible on the screen.
To overcome this difficulty, a method synchronizing the
MCU to write data only during the field interval has been
developed. This represents something of a limitation, but has
to be used only for the 4 user controls.
Another characteristic of the MC44002/7 is that the
Contrast control function is carried out within the RGB
sampling loops. If data is written into the registers during the
time when the RGB loops are taking their samples, then the
situation arises where data is being sampled and changed at
the same time. Hence, the loops will inevitably go unstable.
When this happens, the brightness is seen to vary
uncontrollably while the Contrast is changed. The effect has
been described as “l(fā)oop bounce”.
The timing diagram below show the exact situation.
From the start of the field flyback pulse to the beginning of
the RGB sampling, approximately 1.2 ms is available to write
the I2C data. Therefore, with a reasonable safety margin, the
write time should be limited to only about 1.0 ms. This should
not present any serious difficulty since only the data byte has
to be transmitted during this time, and then only for the 4 user
controls.
1.2 ms
Loop Sampling
Waveform (Pin 20)
Video Field Interval
Field Flyback
Synchronizing
Pulse
R
G
B
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