Datasheet

EA OLEDM204
Printing and typographical errors reserved. Page 4
ELECTRONIC ASSEMBLY reserves the right to change specification without prior note.
DATA TRANSFER 3-WIRE SPI (8 BIT)
Data transmission for SPI is unidirectional, that means that data can only be written, there’s no data read
option. Selection for writing data or command is done with the DC bit.
A busy check is not necessary at all. Clock rate may be up to 1 MHz. Data transmission is based on SPI
mode 3, MSB first. For more details please refer to the controllers data sheet SSD1311.
DATA TRANSFER I²C
The I²C mode provides a bi-directional data transmission: That means that data can be written and read.
Because SA0 is internally set to GND, the I²C address is 0x78 (0x3C). The clock rate may be up to 400 KHz.
Please make sure when defining the pull-up resistors that the internal resistance of the display is 600..1000
. This affects the low level when reading data and ACK bit.
Attention: When reading data, after the command for page- or column address there need to be a dummy
read (discard the first byte).
Control byte: C
o
(Continuation bit) = 0  Display data do follow; 1  refer D/C bit.