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UPD6465CS 数据表(PDF) 15 Page - NEC |
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UPD6465CS 数据表(HTML) 15 Page - NEC |
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15 / 52 page  µPD6464A,6465 15 2.6 Video Signal Method Control Command The µPD6464A, 6465 can select the NTSC, PAL, and PAL-M methods for the internal video signal. The µPD6464A can also select the PAL-N method. When the SECAM method is selected, the internal video signal is output by the PAL method. D7 D6 D5 D4 D3 D2 D1 D0 01 0 0 1 N/P2Note N/P1 N/P0 Video signal method control bits N/P1 N/P0 00 01 11 Function NTSC PAL SECAM 10 PAL-M N/P2 0 0 0 0 00 PAL-N 1 Setting prohibited Note Fixed to “0” ( PD6465). µ • Video signal method control bits These bits can generate internal NTSC, PAL, PAL-M and PAL-N ( µPD6464A only) video signals. With the SECAM method, however, a color subcarrier from the SECAM color subcarrier input pin (pin 22) is fixed in the external mode. In the internal mode, an internal PAL video signal is generated. The internal video signal is generated by using a ×4 multiplier or an external crystal. Use a crystal with a frequency of 4 fSC for each video signal. |
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