Datasheet

TVP5158, TVP5157, TVP5156

SLES243G –JULY 2009–REVISED APRIL 2013

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Table 4-56. Blue Screen Cr Control

Subaddress 92h

Default 80h

7 6 5 4 3 2 1 0

Cr value [9:2]

The Cr value of the color screen output when enabled by bit 2 or 3 of the Output Formatter 2 register is programmable using a 10-bit value.

The 8 MSBs, bits[9:2], are represented in this register. The remaining two LSB are found in the Blue Screen LSB register. The default color

screen output is black. See Table 4-54 for example colors.

Table 4-57. Blue Screen LSB Control

Subaddress 93h

Default 00h

7 6 5 4 3 2 1 0

Reserved Y value LSB [1:0] Cb value LSB [1:0] Cr value LSB [1:0]

The two LSBs for the Blue screen Y, Cb, and Cr values are represented in this register. See Table 4-54 for example colors.

Table 4-58. Noise Measurement

Subaddress 94h-95h

Default Read Only

Subaddress 7 6 5 4 3 2 1 0

94h Noise Measurement [7:0]

95h Noise Measurement [15:8]

Noise measurement [15:0]

Used by the weak signal detection algorithm.

Because this register is a double-byte register, it is necessary to "capture" the setting into the register to ensure that the value is

not updated between reading the lower and upper bytes. To cause this register to "capture" the current settings bit 0 of I

C register

24h (status request) should be set to a 1. After the internal processor has updated this register, bit 0 of register 24h is cleared,

indicating that both bytes of the noise measurement register have been updated and can be read. Either byte may be read first,

because no further update occurs until bit 0 of 24h is set to 1 again.

Table 4-59. Weak Signal High Threshold

Subaddress 96h

Default 60h

7 6 5 4 3 2 1 0

Level [7:0]

This register controls the upper threshold of the noise measurement used to determine whether the input signal should be considered a

weak signal.

Table 4-60. Weak Signal Low Threshold

Subaddress 97h

Default 50h

7 6 5 4 3 2 1 0

Level [7:0]

This register controls the lower threshold of the noise measurement used to determine whether the input signal should be considered a

weak signal.

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