DATA SHEET - Glyn High-Tech Distribution

HX8346-A(T)240RGB x 320 dot, 262K color, TFT Mobile Single Chip Driver5.1.1 Register-Content Interface ModeDATA SHEET V01The register-content interface circuit in HX8346-A supports 18-/16-/8-bit bus widthparallel bus system interface for I80 series and M68 series CPU, and serial bus systeminterface for serial data input. When NCS = “L”, the parallel and serial bus systeminterface of the HX8346-A become active and data transfer through the interface circuitis available. The DNC_SCL pin specifies whether the system interface circuit access isto the register command or to the GRAM. The input bus width format of system interfacecircuit is selected by external pins BS(2-0) setting. For selecting the input bus format,please refer to Table5.2 and Table5.3.In Register-Content interface, it includes an Index Register (IR) be stored index data ofinternal control register and GRAM. Therefore, the IR can be written with the indexpointer of the control register through data bus by setting DNC_SCL=0. Then thecommand or GRAM data can be written to register at which that index pointer pointed bysetting DNC_SCL=1.Furthermore, there are two 18-bit bus control registers used to temporarily store the datawritten to or read from the GRAM. When the data is written into the GRAM from theMPU, it is first written into the write-data latch and then automatically written into theGRAM by internal operation. Data is read through the read-data latch when reading fromthe GRAM. Therefore, the first read data operation is invalid and the following read dataoperations are valid.P68Input signal format selection0 Format for I80 series MPU1 Format for M68 series MPUTable 5. 2 MPU selection in Register-content Interface CircuitTransferring Method Transferring MethodBS2 BS1 BS0 Interfaceof RAM dataof Command0 0 0 16-bit collective16-bit system interface0 0 116-bit + 2 bit8-bit collective0 1 0 18-bit system interface 18-bit collective0 1 1 8-bit system interface 8-bit + 8-bit + 8-bit1 1 x Serial bus transfer interface 16 or 24-bit serial 8-bit serialTable 5. 3 Interface Selection in Register-content Interface ModeHimax ConfidentialThis 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.32-July, 2007