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MT9V032 Datasheet(PDF) 20 Page - ON Semiconductor |
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MT9V032 Datasheet(HTML) 20 Page - ON Semiconductor |
20 / 61 page MT9V032 www.onsemi.com 20 Shadowed Registers Some sensor settings cannot be changed during frame readout. For example, changing the register Window Width (R0x04) part way through frame readout results in inconsistent LINE_VALID behavior. To avoid this, the MT9V032 double buffers many registers by implementing a “pending” and a “live” version. Two−wire serial interface reads and writes access the pending register. The live register controls the sensor operation. The value in the pending register is transferred to a live register at a fixed point in the frame timing, called “frame−start.” Frame−start is defined as the point at which the first dark row is read out. By default, this occurs four row times before FRAME_VALID goes HIGH. To determine which registers or register fields are double−buffered in this way, see the “Shadowed” column in Table 8. • Shadowed N = No. The register value is updated and used immediately. Y = Yes. The register value is updated at next frame start. Frame start is defined as when the first dark row is read out. By default this is four rows before FRAME_VALID goes HIGH. • Read/Write R = Read−only register/bit. W = Read/Write register/bit. Table 8 provides a detailed description of the registers. Bit fields that are not identified in the table are read only. Table 8. REGISTER DESCRIPTIONS Bit Bit Name Bit Description Default in Hex (Dec) Shad- owed Legal Values (Dec) Read/ Write 0X00/0XFF (0/255) CHIP VERSION 15:0 Chip Version Chip version—read−only Iter. 1: 0x1311 (4881) Iter. 2: 0x1311 (4881) Iter. 3: 0x1313 (4883) R 0X01 (1) COLUMN START 9:0 Column Start The first column to be read out (not counting dark columns that may be read). To window the image down, set this register to the starting X value. Readable/active col- umns are 1–752. 1 Y 1–752 W 0X02 (2) ROW START 8:0 Row Start The first row to be read out (not counting any dark rows that may be read). To window the image down, set this register to the starting Y value. Setting a value less than four is not recommended since the dark rows should be read using R0x0D. 4 Y 4–482 W 0X03 (3) WINDOW HEIGHT 8:0 Window Height Number of rows in the image to be read out (not counting any dark rows or border rows that may be read). 1E0 (480) Y 1–480 W 0X04 (4) WINDOW WIDTH 9:0 Window Width Number of columns in image to be read out (not counting any dark columns or border columns that may be read). 2F0 (752) Y 1–752 W 0X05 (5) HORIZONTAL BLANKING 9:0 Horizontal Blanking Number of blank columns in a row. Minimum horizontal blanking is 43 columns. 05E (94) Y 43–1023 W 0X06 (6) VERTICAL BLANKING 14:0 Vertical Blanking Number of blank rows in a frame. This number must be equal to or larger than four. 002D (45) Y 4–3000 W 0X07 (7) CHIP CONTROL |
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Descripción similar - MT9V032_17 |
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