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STV9422 Datasheet(PDF) 7 Page - STMicroelectronics |
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STV9422 Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 15 page  FUNCTIONAL DESCRIPTION (continued) I.3 - Addressing Space STV9422/24registers, RAM and ROM are mapped in a 16Kbytes addressing space. The mapping is the following : 0000 1024 bytes RAM Descriptors character codes user definable characters 03FF 0400 Empty Space 1FFF 2000 Character Generator ROM 32FF 3300 Empty Space 3FFF 3FF0 Internal Registers 3FFF I.4 - Register Set LINE DURATION 3FF0 VSP HSP LD5 LD4 LD3 LD2 LD1 LD0 * 0 0 1 11 111 VSP : V-SYNC active edge selection = 0 : falling egde, = 1 : rising edge HSP : H-SYNC active edge selection = 0 : falling egde, = 1 : rising edge LD[5:0] : LINE DURATION (number of pixel period per line divided by 12 ie. Unit = 12 pixel periods). HORIZONTAL DELAY 3FF1 DD7 DD6 DD5 DD4 DD3 DD2 DD1 DD0 * 000 01 000 DD[7:0] : HORIZONTAL DISPLAY DELAY from the H-SYNC reference falling edge to the 1 st pixel position of the character strips. Unit = 3 pixel periods. CHARACTERS HEIGHT 3FF2 - - CH5 CH4 CH3 CH2 CH1 CH0 * - - 0 100 10 CH[5:0] : HEIGHT of the character strips in scan lines. For each scan line, the number of the slice which is displayed is given by : SLICE-NUMBER = round SCAN ±LINE±NUMBER x 18 CH[5:0] . SCAN-LINE-NUMBER = Number of the current scan line of the strip. DISPLAY CONTROL 3FF3 OSD FBK FL1 FL0 - P8 P7 P6 * 0 0 0 0 - 000 OSD : ON/OFF (if 0, R, G, B and FBLK are 0). FBK : Fast blanking control : = 1 : FBLK = 1, forcing black where these is no display, = 0 : FBLK is active only during character display. FL[1:0] : Flashing mode : - 00 : No flashing. The character attribute is ignored, - 01 : 1/1 flashing (a duty cycle = 50%), - 10 : 1/3 flashing, - 11 : 3/1 flashing. P[8:6] : Address of the 1 st descriptor of the current displayed pages. P[13:9] and P[5:0] = 0 ; up to 8 different pages can be stored in the RAM. LOCKING CONDITION TIME CONSTANT 3FF4 FR AS2 AS1 AS0 - BS2 BS1 BS0 * 0 0 1 0 - 010 FR : Free Running ; if = 1 PLL is disabled and the pixel frequency keeps its last value. AS[2:0] : P h a s e c o ns t an t dur i n g l oc k in g conditions. BS[2:0] : Frequency constant during locking conditions. CAPTURE PROCESS TIME CONSTANT 3FF5 - AF2 AF1 AF0 - BF2 BF1 BF0 * - 0 1 1 - 011 AF[2:0] : Phase constant during the capture process. BF[2:0] : Frequency constant during the capture process. INITIAL PIXEL PERIOD 3FF6 PP7 PP6 PP5 PP4 PP3 PP2 PP1 PP0 * 0 010 1 000 PP[7:0] : Value to initialize the pixel period of the PLL. FREQUENCY MULTIPLIER 3FF7 - - - - FM3 FM2 FM1 FM0 * - - --1 0 1 0 FM[3:0] : Frequency multiplier of the crystal frequency to reach the high frequency used by the PLL to derive the pixel frequency. STV9422 - STV9424 7/15 |
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Similar Description - STV9422 |
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