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STV9421 Datasheet(PDF) 9 Page - STMicroelectronics |
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STV9421 Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 16 page  H-SYNC 012 3 n + 1 n + 2 n + 3 n + 4 LD - 1 LD 0 1 Character Period R, G, B LD[5:0] Fixed DD[7:0] = 4 (min) = 4n + 2 Given by number of characters of the strips Figure 5 : Horizontal Timing FUNCTIONAL DESCRIPTION (continued) IV.2 - D to A Timing (STV9421) The D to A converters of the STV9421 are pulse width modulater converter. The frequency of the output signal is : FXTAL 256 and the duty cycle is : V1[7:0] 256 per cent. After a low pass filter, the average value of the output is : V1 [7:0] 256 ⋅ VDD 0 1 128 255 V1[7:0] 256 . t XTAL P WM1 S igna l t XTAL Figure 6 : PWM Timing V - Display Control A screen is composed of successive scanlines gath- ered in several strips. Each strip is defined by a descriptor stored in memory. A table of descriptors allows screen composition and different tables can be stored in memory at the page addresses (8 possible ≠ addresses). Two types of strips are available : - Spacing strip : its descriptor (see II) gives the number of black (FBK = 1 in DISPLAY CONTROL register) or transparent (FBK = 0) lines. - Character strip : its descriptor gives the memory address of the character codes corresponding to the 1 st displayed character. The characters and attributes (see code format III) are defined by a succession of codes stored in the RAM at ad- dresses starting from the 1 st one given by the descriptor. A character strip can be displayed or not by using the DE bit of its descriptor. A zoom can be made on it by using the ZY bit. After the falling edge on V-SYNC, the first strip descriptor is read at the top of the current table of descriptors at the address given by P[8:6] (see DISPLAY CONTROL register) ; if it is a spacing strip, SL[7:0] black or transparent scan lines are displayed ; if it is a character strip, during CH[5:0] x (I + ZY) scan lines (CH[5:0] given by the CHARAC- TER HEIGHT register), the character codes are read at the addresses starting from the 1 st one given by the descriptor until a end of line character or the end of the scan line ; the next descriptor is then read and the same process is repeated until the next falling edge on V-SYNC. STV9420 - STV9421 9/16 |
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