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TMP88CS38 Datasheet(PDF) 153 Page - Toshiba Semiconductor |
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TMP88CS38 Datasheet(HTML) 153 Page - Toshiba Semiconductor |
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153 / 226 page  TMP88CS38/CM38A/CP38A 2007-09-12 88CS38-153 2.15.5.2 OSD Data Output Format Control (1) Scan mode The double scan mode is used to handle non-interlaced scanning TV. When double scan mode is enabled, the vertical display counter increases every 2 scan lines and a vertical size of a dot is double. This function is enabled by setting VDSMD (Bit7 in ORETC) in the OSD control register to “1”. Scan mode select register (1 bit)......... VDSMD (Bit7 in ORETC) “0” ......... Normal mode “1” ......... Double scan mode Note 1: The data written to those control register is transferred to the OSD circuit and become valid when the data is written. Note 2: When OSD circuit is used on an interlace scanning TV, a jitter elimination circuit must be enabled and set AFLD to “1” in JECR. Table 2.15.1 The Difference of 2 Types of Scan Mode Normal Mode Double Scan Mode Specification unit of vertical display start position One scanning line Two scanning lines 1 dot height − Normal mode height × 2 Figure 2.15-9 Scan Mode Normal mode Double scan mode Interlace scanning Normal mode Double scan mode Non-interlace scanning |
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