User Manual

Chapter 3. Hardware Description
◆ J9
16-pin header connector
figure 3-18 J9 PIN header
Pin Signal Description
1, 2 VCC 3.0~5.5V DC input
3 RXD Receive Data (Input)
4 TXD Transmit Data (Output)
5 RTS Request to Send (Output)
6 CTS Clear to Send (Input)
7,8 NC No Connection
9 RDY#
Ready indicator (Active low output)
Processor status can be indicated, when connected as below.
10 nRESET
Connection to external reset switch (Input)
As reset logic is built-in, this pin can be connected directly to the
switch without any additional circuit. When pressing the switch
for more than 5 seconds (low input), factory default settings are
restored.
11 GND Ground
12 GND Ground
13 GPIO0 Programmable I/O 0 (user-defined I/O)
14 GPIO1 Programmable I/O 1 (user-defined I/O)
15 GPIO2 Programmable I/O 2 (user-defined I/O)
16 GPIO3 Programmable I/O 3 (user-defined I/O)
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