TVP5146PFP 参数 Datasheet PDF下载

2.11.67 VDP TTX Filter Control Register

Subaddress

Default

7

BBh

00h

6

Reserved

5

4

Filter logic [1:0]

3

2

Mode

1

TTX filter 2 enable

0

TTX filter 1 enable

Filter logic [1:0]: Allow different logic to be applied when combining the decision of filter 1 and filter 2 as follows:

00 = NOR (default)

01 = NAND

10 = OR

11 = AND

Mode: indicates which teletex mode is in use.

0 = Teletext filter applies to 2 header bytes (default)

1 = Teletext filter applies to 5 header bytes

TTX filter 2 enable: provides for enabling the teletex filter function within the VDP.

0 = Disabled (default)

1 = Enabled

TTX filter 1 enable: provides for enabling the teletex filter function within the VDP.

0 = Disabled (default)

1 = Enabled

If the filter matches or if the filter mask is all 0s, then a true result is returned.

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