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ST6385 数据表(PDF) 49 Page - STMicroelectronics |
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ST6385 数据表(HTML) 49 Page - STMicroelectronics |
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49 / 84 page  49/84 ST6365, ST6375, ST6385 ST6367, ST6377, ST6387 ON-SCREEN DISPLAY (Cont’d) Table 15. Format Character Register Colour Setting. Table 16. Format Character Register Size Display Character Register (DCR) See Data RAM table description for Specific Ad- dress - Write only Caution: This register contains at least one write only bit. Single bit instructions (SET, RES, INC and DEC) should not be used. D7. This bit is not used. D6. This bit is fixed to “0”. C5-C0. Character type. The 6 character type bits define one of the 64 available character types. These character types are shown on the following pages. Character Types The character set is user defined as ROM mask option. Register and RAM Addressing The OSD contains seven registers and 80 RAM lo- cations. The seven registers are the Vertical Start Address register, Horizontal Start Address regis- ter, Vertical Space register, Horizontal Space reg- ister, Background Control register, Global Enable register and Character Bank Select register. The Global Enable register can be written at any time by the ST63 Core. The other six registers and the RAM can only be read or written to if the global en- able is zero. The six registers and the RAM are located on two pages of the paged memory of the ST638x MCUs; the Character Bank Select register is located out- side the paged memory at address EDh. Each page contains 64 memory locations. This paged memory is at memory locations 00h to 3Fh in the ST638x memory map. A page of memory is ena- bled by setting the desired page bit, located in the Data Ram Bank Register, to a one. The page reg- ister is location E8h. A one in bit five selects page 5, located on the OSD and a one in bit 6 selects page 6 on the OSD. Table 17 shows the address- es of the OSD registers and RAM. Table 17. OSD Control Registers and Data RAM Addressing R G B Colour 0 0 0 Black 0 0 1 Blue 0 1 0 Green 0 1 1 Cyan 1 0 0 Red 1 0 1 Magenta 1 1 0 Yellow 1 1 1 White GS2 GS1 S Vertical Height Horizontal length 0 0 0 18H 6 TDOT 0 0 1 36H 12 TDOT 0 1 0 18H 6 TDOT 0 1 1 54H 18 TDOT 1 0 0 36H 12 TDOT 1 0 1 54H 18 TDOT 1 1 0 36H 12 TDOT 1 1 1 72H 24 TDOT 70 - “0” C5 C4 C3 C2 C1 C0 Page Address Register or RAM 5 00h - 3Fh RAM Locations 00h - 3Fh 6 00h - 0Fh RAM Locations 00h - 0Fh 6 10h Vertical Start Register 6 11h Horizontal Start Register 6 12h Vertical Space Register 6 13h Horizontal Space Register 6 14h Background Control Register 6 17h Global Enable Register No Page EDh Character Bank Select Register |
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