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数据搜索系统，热门电子元器件搜索 |
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LM2467 数据表(PDF) 34 Page - National Semiconductor (TI) |
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LM2467 数据表(HTML) 34 Page - National Semiconductor (TI) |
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34 / 43 page  Control Register Definitions (Continued) CHSDWCTRLB1 (0x840A) CHSDWCTRLB0 (0x8409) Reserved Shadow - Green Shadow - Red Shadow - Blue XXXXXXX G[2:0] R[2:0] B[2:0] Bits 8–0 These registers determine the heavy button box lowlight, shading or shadow color. Bits 15–9 Reserved. These bits should be set to zero. ROM Signature Control Register: ROMSIGCTRL (0x840D) Reserved check X XXXXXX CRS Bit 0 This controls the calculation of the ROM signature. Setting this bit causes the ROM to be read sequentially and a 16-bit checksum calculated over the 254 characters. The sum, modulo 65535, is stored in the ROM Signature Data Register, and this bit is then automatically cleared. Bits 7–1 Reserved. These should be set to zero. ROM Signature Data: ROMSIGDATAB1 (0x840F) ROMSIGDATAB0 (0x840E) 16-Bit Checksum CRC[15:0] Bits 15–0 This is the checksum of the 254 ROM characters truncated to 16 bits (modulo 65535). All devices with the same masked ROM will have the same checksum. Display Window 1 Horizontal Start Address: HSTRT1 (0x8410) Window 1 Horizontal Start Location 1H[7:0] Bits 7–0 There are two possible OSD windows which can be displayed simultaneously or individually. This register determines the horizontal start position of Window 1 in OSD pixels (not video signal pixels). The actual position, to the right of the horizontal flyback pulse, is determined by multiplying this register value by 4 and adding 30. Due to pipeline delays, the first usable start location is approximately 42 OSD pixels following the horizontal flyback time. For this reason, we recommend this register be programmed with a number larger than 2, otherwise improper operation may result. Display Window 1 Vertical Start Address: VSTRT1 (0x8411) Window 1 Vertical Start Address 1V[7:0] Bits 7–0 This register determines the Vertical start position of the Window 1 in constant-height character lines (not video scan lines). The actual position is determined by multiplying this register value by 2. (Note: each character line is treated as a single auto-height character pixel line, so multiple scan lines may actually be displayed in order to maintain accurate position relative to the OSD character cell size. See the Constant Character Height Mechanism section.) This register should be set so the entire OSD window is within the active video. Display Window 1 Start Address: W1STRTADRH (0x8413) W1STRTADRL (0x8412) Reserved Window 1 Start Address XXXXXXX 1AD[8:0] www.national.com 34 |
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