RAiO RA8875 Character/Graphic TFT LCD Controller Specification RAiO Technology Inc. ©Copyright RAiO Technology Inc. 2011

Character / Graphic TFT LCD Controller Update History Version 1.0 Description Preliminary Version Remove Serial Flash Address 32 bit Mode 1. Modify REG[05h] 2. Remove REG [B3h] 3. Modify REG[E1h] 4. Modify Section 7-10-1 : DMA In Continuous Mode 5. Modify Section 7-10-2 : DMA In Block Mode

Character / Graphic TFT LCD Controller

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Character / Graphic TFT LCD Controller

Character / Graphic TFT LCD Controller

Character / Graphic TFT LCD Controller 1. Description RA8875 is a text/graphic mixed display with 2 layers TFT LCD controller. It is designed to meet the requirement of middle size TFT module up to 800x480 pixels with characters or 2D graphic application. Embedded 768KB display RAM provides user a flexible solution for display buffer of almost application. Besides, the interface of external serial flash is optional to provide the up to 32x32pixels font bitmap for BIG5/GB coding. For graphic usage, RA8875 supports a 2D Block Transfer Engine(BTE) that is compatible with 2D BitBLT function for processing...

Character / Graphic TFT LCD Controller 3. Block Diagram 3-1 Block Diagram DB[15:0] RD#/EN# WR#/RW# CS# RS C86 WAIT# INT# SCL SDI SDO SCS# SIFS0 SIFS1 IICA[1:0] KOUT [3:0]/ GPO [3:0] KIN [4:0]/ GPI [4:0] GPOX GPIX KEYSCAN Controller Geometric Speed-up Engine FONT Engine Register Block 4 wires Touch Panel Controller PDAT[15:0] HSYNC VSYNC PCLK DE SFCL SFDI SFDO SFCS0# SFCS1# Pattern/ Cursor Scroll Engine Figure 3-1 : RA8875 Block Diagram 3-2 System Block Diagram SPI /I2C Serial Flash RA8875 4 wires Touch Panel KEYPAD /GPIO Figure 3-2 : RA8875 System Block Diagram

Character / Graphic TFT LCD Controller 4. Pin Description 4-1 MCU Interface Pin Name Pin Description Data Bus These are data bus for data transfer between MCU and RA8875. When setting register number and register data, DB[7:0] is used. When writing data to display RAM, DB[15:0] is used according to data bus mode setting. DB[15:8] will be input and should be pull-low or pullhigh when 8-bit data bus mode is used. Enable/Read Enable When MCU interface (I/F) is 8080 series, this pin is used as RD# signal (Data Read) , active low. When MCU I/F is 6800 series, this pin is used as EN signal (Enable),...

Character / Graphic TFT LCD Controller 4-2 Serial MCU Interface Pin Name Pin Description SPI Clock 3-wire, 4-wire Serial or IIC I/F clock. If no use, please connect it to VDDP. IIC data /4-wire SPI Data Input 4-wire SPI I/F: Data input for serial I/F. 3-wire SPI I/F: NC, please connect it to VDDP. IIC I/F: Bi-direction data for serial I/F If no use, please connect it to VDDP. 3-wire SPI Data /4-wire SPI Data Output 4-wire SPI I/F: Data output for serial I/F. 3-wire SPI I/F: Bi-direction data for serial I/F IIC I/F: NC, if no use, please keep floating. If no use, please keep floating. SPI Chip...

Character / Graphic TFT LCD Controller 4-4 Serial Flash/ROM Interface Pin Name External Serial Flash/ROM Clock Serial Flash/ROM SPI I/F clock. External Flash/ROM SPI Data Input Single mode: Data input of serial Flash/ROM SPI I/F. For RA8875, it is output (Default). Dual mode: The signal is used as bi-direction data #0(SIO0). External Flash/ROM SPI Data Output Single mode: Data output of serial Flash/ROM SPI I/F. For RA8875, it is input (Default). Dual mode: The signal is used as bi-direction data #1(SIO1). External Flash/ROM SPI Chip Select 0 Chip select pin for serial Flash/ROM SPI I/F #0. External...

Character / Graphic TFT LCD Controller 4-8 Clock and Power Interface Pin Name Pin Description Crystal Input Pin Input pin for internal crystal circuit. It should be connected to external crystal circuit. That will generate the system clock for RA8875. Crystal Output Pin Output pin for internal crystal circuit. It should be connected to external crystal circuit. That will generate the system clock for RA8875. Reset Signal Input This active-low input performs a hardware reset on the RA8875. It is a Schmitt-trigger input with pull-up resistor for enhanced noise immunity; however, it must ensure...

Character / Graphic TFT LCD Controller 5. Register There are 4 types of cycles used in MCU interface of RA8875, please refer to Table 5-1 for detail. The programming or reading of the registers in RA8875 is composed by the cycles. RA8875 includes a status register and tens of instruction registers. The status register is read only and can be read by “Status Read” cycle. The instruction registers, that is used to program almost functions, can be programmed by “Command Write” cycle and “Data Write” cycle. The “Command Write” cycle sets the register number to program, and the “Data Write” cycle...

Character / Graphic TFT LCD Controller The registers function description is listed below, for each register, a register name and register number is described upper each register function table. Each register contains up-to 8 bits data. In the register function table, detail description, default value and access attribute (RO: Read only, WO: Write only, RW: Read-able and Write-able) are described. 5-1 Status Register Status Register (STSR) Bit 7 Memory Read/Write Busy (Include Font Write Busy) 0 : No Memory Read/Write event. 1 : Memory Read/Write busy. BTE Busy 0 : BTE is done or idle. 1 : BTE...

Character / Graphic TFT LCD Controller REG[02h] Memory Read/Write Command (MRWC) Bit Write Function : Memory Write Data Data to write in memory corresponding to the setting MWCR1[3:2]. Continuous data write cycle can be accepted bulk data write case. Read Function : Memory Read Data Data to read from memory corresponding to the setting MWCR1[3:2]. Continuous data read cycle can be accepted bulk data read case. Note that the first data read cycle dummy read and need to be ignored. REG[04h] Pixel Clock Setting Register (PCSR) Bit 7 6-2 Description PCLK Inversion 0 : PDAT is fetched at PCLK rising...