SPI Timing Format¶
SPI commands are used to communicate between the host and the COG driver. The SPI format used differs from the standard in that two-way communications are not used.
When setting up the SPI timing, PDI recommends verifying both the SPI command format and the SPI command timing in this section.
SPI pin definition 1. SCLK - serial peripheral interface clock 2. SDIN - serial peripheral interface data 3. D/C# - serial peripheral interface command and data pin 4. M_CS# - master panel chip select 5. S_CS# - slave panel chip select
The maximum clock speed of the display is 20MHz (Write), 2.5MHz (Read).
| Step | Pin/Register | Data/Value | Name/Unit | Comment |
|---|---|---|---|---|
| SPI | 0x50 | 0x27 | Fast Update only | |
| SPI | 0x10 | Image array | DTM1 | Old image for Fast |
| SPI | 0x13 | Image array | DTM2 | New image for Fast |
| SPI | 0x50 | 0x07 | Fast Update only |
With
- Register is the register index, in the examples
0x50,0x10, and0x13. - Data/Value could be
- A fixed value, in the example
0x27, - Multiple values, in the example DTM1 and DTM2 for image data array,
- A fixed value, in the example
- The D/C line is pulled LOW for command and HIGH for data.
SPI Command Timing¶
The following specifications apply for VDDIO - GND = 2.3V to 3.6V, TOPR = 25°C, CL=20pF
