HX8347 - Adafruit

HX8347-G(T)240RGB x 320 dot, 262K color, TFT Mobile Single Chip Driver5. Function DescriptionDATA SHEET Preliminary V015.1 Display data GRAM mappingThe display data RAM stores display dots and consists of 1,382,400 bits (240x18x320bits). There is no restriction on access to the RAM even when the display data on thesame address is loaded to DAC. There will be no abnormal visible effect on thedisplay when there is a simultaneous Panel Read and Interface Read or Write to thesame location of the Frame Memory.Every pixel (18-bit) data in GRAM is located by a (Page, Column) address (Y, X). Byspecifying the arbitrary window address SC, EC bits and SP, EP bits, it is possible toaccess the GRAM by setting RAMWR or RAMRD commands from start positions ofthe window address.(00,00)H (00,01)H (00,02)H --------- (00,EC)H (00,ED)H (00,EE)H (00,EF)H(01,00)H (01,01)H (01,02)H --------- (01,EC)H (01,ED)H (01,EE)H (01,EF)H(02,00)H (02,01)H (02,02)H --------- (02,EC)H (02,ED)H (02,EE)H (02,EF)H(03,00)H (03,01)H (03,02)H --------- (03,EC)H (03,ED)H (03,EE)H (03,EF)H(04,00)H (04,01)H (04,02)H --------- (04,EC)H (04,ED)H (04,EE)H (04,EF)H(05,00)H (05,01)H (05,02)H --------- (05,EC)H (05,ED)H (05,EE)H (05,EF)H---------------------------------(13A,00)H (13A,01)H (13A,02)H --------- (13A,EC)H (13A,ED)H (13A,EE)H (13A,EF)H(13B,00)H (13B,01)H (13B,02)H --------- (13B,EC)H (13B,ED)H (13B,EE)H (13B,EF)H(13C,00)H (13C,01)H (13C,02)H --------- (13C,EC)H (13C,ED)H (13C,EE)H (13C,EF)H(13D,00)H (13D,01)H (13D,02)H --------- (13D,EC)H (13DED)H (13D17E)H (13D,EF)H(13E,00)H (13E,01)H (13E,02)H --------- (13E,EC)H (13E,ED)H (13E,EE)H (13E,EF)H(13F,00)H (13F,01)H (13F,02)H --------- (13F,EC)H (13F,ED)H (13F,EE)H (13F,EF)HTable 5.1: GRAM address for display panel position--------------------------------5.2 Address Counter (AC) of GRAMThe HX8347-G contains an address counter (AC) which assigns address forwriting/reading pixel data to/from GRAM. The address pointers set the position ofGRAM. Every time when a pixel data is written into the GRAM, the X address or Yaddress of AC will be automatically increased by 1 (or decreased by 1), which isdecided by the register (MV, MX and MY bits) setting.To simplify the address control of GRAM access, the window address function allowsfor writing data only to a window area of GRAM specified by registers. After databeing written to the GRAM, the AC will be increased or decreased within settingwindow address-range which is specified by the (start: SC, end: EC) and the (start:SP, end: EP). Therefore, the data can be written consecutively without thinking a datawrap by those bit function.Himax ConfidentialFor Go-tek OnlyThis information contained herein is the exclusive property of Himax and shall not be distributed, reproduced, or disclosedin whole or in part without prior written permission of Himax.-P.57-October, 2009