Datasheet

EA uniTFT Vorläufig
SHORT PROTOCOLL & SMALL PROTOCOLL
In order to ensure secure data transmission, 2 differently complex transmission protocols are integrated. In both
protocols, the user data is embedded into a packet by adding a start and a final sequence. We recommend to use
the short protocol, but for compatibility with the EA eDIPxxx series you can continue with the small protocol.
For initial tests on the serial interface, the protocol can also be switched off completely (Pin 22 "DPROT" to low).
Both protocols are independent of the interface RS-232, SPI, I²C or USB used. The data transmission is embed-
ded in a fixed frame with checksum. The module acknowledges this package with the character <ACK> (= $ 06)
on successful reception or <NAK> (= $ 15) if the checksum is incorrect or receive buffer is overflowed. In either
case, after received <NAK> the complete package is discarded and must be sent again.
Note: The <ACK> must be actively read SPI and I²C). If the host does not receive an acknowledgment, at least
one byte has been lost. In this case, the timeout time must be waited before the packet is completely repeated.
The number (len) of the user data per packet can be max.2042 Byte. Commands larger than 2042 byte (for exam-
ple, images or file #FWD ...) must be split into several packages. The user data in the individual packets are reas-
sembled after correct reception
Technische Änderung vorbehalten.
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