1. Triode level transistor circuit solution is not suitable for applications with baud rates exceeding 460
kbps.
2. Please note that the module CTS is connected to the host CTS, and the module RTS is connected
to the host RTS.
3.11. SPI Interface
The SPI interface of EC200U series module only supports master mode. It allows the full duplex
synchronous communication between module and peripherals. Its working voltage is 1.8 V, and the
maximum clock frequency is 25 MHz. If a universal 4-wire SPI interface is used to connect to Nor Flash, it
provides the basic Flash operation including reading, writing and erasing, and does not support the file
system.
Table 18: Pin Definition of SPI interface
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