HD66773R Datasheet, PDF (15/133 Pages) Renesas Technology Corp – 262,144-color, 132 x 176-dot Graphics Controller Driver for TFT LCD panels

HD66773R
Block Function
1. System Interface
The HD66773R incorporates three kinds of high-speed system interfaces: 68-system and 80-system
interfaces with 18-/16-/9-/8-bit bus, and Serial Peripheral Interface (SPI). The interfacing mode is selected
with IM3-0 pins.
The HD66773R has three 16-bit registers: index register (IR), write data register (WDR), and read data
register (RDR). The IR stores the information of each control register and the index information of GRAM.
The WDR temporarily stores data before written to the control register or GRAM. The RDR temporarily
stores the data, which is read from GRAM. Data written into GRAM from the MPU is first written into the
WDR and then is automatically written into GRAM by internal operation. Since data are read through the
RDR from GRAM, the data read out first are invalid and the ensuing data are read out normally.
The execution time for the instructions other than oscillation start is 0-clock cycle, which enables
instructions to be written consecutively.
Register Selection (8/9/16/18 Parallel Interface)
80-system
WR*
RD*
0
1
1
0
0
1
1
0
68-system
R/W
0
1
0
1
RS Operation
0 Write index into IR
0 Read internal status
1 Write to control register and GRAM through WDR
1 Read from GRAM through RDR
Register Selection (Serial Peripheral Interface)
Start byte
R/W Bits RS Bits
0
0
1
0
0
1
1
1
Operations
Write index into IR
Read internal status
Write to control register and GRAM through WDR
Read from GRAM through RDR
2. Bit Operation
The HD66773R supports write data mask function to write bit data selectively to GRAM and logical
arithmetical operation to perform logical arithmetical operation and conditional rewrite on GRAM display
data and then rewrite the data to GRAM. These functions significantly reduce the load on the graphics-
processing software in the microcomputer, and enable high-speed overwrite of GRAM display data. For
details, see “Graphics Operation Function”.
Rev.1.10, Jun.21.2003, page 15 of 133