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ST7787 Datasheet(PDF) 151 Page - Sitronix Technology Co., Ltd. |
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ST7787 Datasheet(HTML) 151 Page - Sitronix Technology Co., Ltd. |
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151 / 217 page  ST7787 Ver. 1.7 2008.04.18 151 10.1.29 VSCSAD (37h): Vertical Scroll Start Address of RAM 37H VSCSAD (Vertical Scroll Start Address of RAM) Inst / Para D/CX WRX RDX D17-8 D7 D6 D5 D4 D3 D2 D1 D0 (Code) VSCSAD 0 ↑ 1 - 0 0 1 1 0 1 1 1 (37h) 1st Parameter 1 ↑ 1 - - - - - - - - SSA8 2 nd Parameter 1 ↑ 1 - SSA7 SSA6 SSA5 SSA4 SSA3 SSA2 SSA1 SSA0 NOTE: “-” Don’t care, can be set to VDDI or DGND level Description -This command is used together with Vertical Scrolling Definition (33h). These two commands describe the scrolling area and the scrolling mode. -The Vertical Scrolling Start Address command has one parameter which describes which line in the Frame Memory will be written as the first line after the last line of the Top Fixed Area on the display as illustrated below: -This command Start the scrolling. -Exit from V-scrolling mode by commands Partial mode On (12h) or Normal mode On (13h). When MADCTL ML= ‘0’ Example: －When Top Fixed Area=Bottom Fixed Area=00, Vertical Scrolling Area=320 and Vertical Scrolling Pointer SSA= ’3’. When MADCTL ML = ‘1’ Example: －When Top Fixed Area= Bottom Fixed Area=00, Vertical Scrolling Area=320 and SSA= ’3’ NOTE: -When new Pointer position and Picture Data are sent, the result on the display will happen at the next Panel Scan to avoid tearing effect. -SSA refers to the Frame Memory scan address. Restriction -Since the value of the Vertical Scrolling Start Address is absolute (with reference to the Frame Memory), it must not enter the fixed area (defined by Vertical Scrolling Definition (33h)- otherwise undesirable image will be displayed on the Panel. SSA[7:0] is based on 1-line unit. -SSA[7:0] = 0000h, 0001h, 0002h, 0003h, … , 00A1h Register Availability Status Availability Normal Mode On, Idle Mode Off, Sleep Out Yes Normal Mode On, Idle Mode On, Sleep Out Yes Partial Mode On, Idle Mode Off, Sleep Out No Partial Mode On, Idle Mode On, Sleep Out No Sleep In Yes Top-Left (0,0) SSA[7:0] Scroll start address (Example) Scan address Memory Display 0 G1 1 G2 2 G3 3 G4 ∣ | ∣ | 318 G319 319 G320 Top-Left (0,0) SSA[7:0] Scroll start address (Example) Scan address Memory Display 319 G1 318 G2 ∣ G3 ∣ G4 3 | 2 | 1 G319 0 G320 |
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