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M37151M6 Datasheet(PDF) 68 Page - Renesas Technology Corp |
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M37151M6 Datasheet(HTML) 68 Page - Renesas Technology Corp |
68 / 138 page M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP Rev.1.00 Nov 01, 2002 page 68 of 136 REJ03B0129-0100Z The horizontal display start position is common to all blocks, and can be set in 128 steps (where 1 step is 4TOSC, TOSC being the OSD oscillation cycle) as values “0016” to “FF16” in bits 0 to 6 of the hori- zontal position register (address 00D116). The horizontal position reg- ister is shown in Figure 8.11.8. Fig. 8.11.8 Horizontal Position Register Notes 1 : 1TC (TC : OSD clock cycle divided in pre-divide circuit) gap occurs between the horizontal display start position set by the horizontal position register and the most left dot of the 1st block. Accordingly, when 2 blocks have different pre-divide ratios, their horizontal dis- play start position will not match. 2 : The horizontal start position is based on the OSD clock source cycle selected for each block. Accordingly, when 2 blocks have different OSD clock source cycles, their horizontal display start position will not match. 3 : When setting “0016” to the horizontal position register, it needs an approximately 62TOSC (= Tdef) interval from a rising edge (when nega- tive polarity is selected) of HSYNC signal to the horizontal display start position. Fig. 8.11.9 Notes on Horizontal Display Start Position 4TOSC’ ✕ N 4TOSC ✕ N HSYNC 1TC 1TC 1TC Note 1 Note 2 Block 2 (Pre-divide ratio = 2, clock source = data slicer clock) Block 3 (Pre-divide ratio = 3, clock source = data slicer clock) Block 4 (Pre-divide ratio = 3, clock source = OSC1) Tdef Tdef’ N : Value of horizontal position register (decimal notation) 1TC : OSD clock cycle divided in pre-divide circuit TOSC : OSD oscillation cycle Tdef : 62 TOSC b7 b6 b5 b4 b3 b2 b1 b0 Horizontal position register (HP) [Address 00D116] BName Horizontal Position Register 7 Horizontal display start position control bits (HP0 to HP6) Nothing is assigned. This bit is a write disable bit. When this bit is read out, the value is “0.” Functions After reset R W Horizontal display start position 4Tosc ✕ n (n: setting value, Tosc: OSD oscillation cycle) 0 0 RW R— 0 to 6 Note: The setting value synchronizes with the V SYNC. |
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