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STV9936P Datasheet(PDF) 29 Page - STMicroelectronics |
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STV9936P Datasheet(HTML) 29 Page - STMicroelectronics |
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29 / 48 page  29/48 STV9936P/S RAM Specification The user must reserve a memory space for the largest window. According to the example shown in Figure 5, the total number of characters/spaces are: For example, to change the size of Window 3 from 3 rows of 6 characters to 5 rows of 4 characters, the resulting size is 20 characters. The number of rows increases and the number of characters per row decreases. The required memory is at least 20 characters. Note: A space is considered as being a character. The memory allocation is made by blocks of 32 characters. The maximum size of a window is 16 rows of 32 characters, or 512 characters. This corresponds to 16 blocks of 32 characters. 1 block is reserved for the color-boxes (see Chapter 4: Character Specifications on page 19), leaving 22 blocks of 32 characters for character codes (704 characters maximum). The RAM allocation for each window is coded in bits ALWi[3:0]. Window 4 memory allocation uses the remaining memory space. The number of memory blocks allocated for window “i” is (ALWi +1), the range of allocation is 1 to 16 blocks of 32 characters. The total number of blocks is 22. Note: If the user changes only 1 window allocation, the RAM addresses of the following windows change. Consequently we advise you to write the allocation when the windows are not displayed to avoid false images. Table 30: Window Sizes Window Size Window 1 28 Window 2 20 Window 3 18 Window 4 16 Total 82 Table 31: Window RAM Allocation FWR FAC Default Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 80h 09h 39h ALW2[3:0] ALW1[3:0] 80h 0Ah 3h ALW3[3:0] |
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