5.2 Extra UART pin feature
Label
Definition
Function
5V
5V Power output from
UC00A
5V supply from USB, optional for user to power
external device, maximum current is limited from USB
port, normally is 900mA. This is constant 5V from
USB. It will not be affected by Vsel slide switch at ‘G’.
GND Ground or negative
Ground of power and signal. This pin should be
connected to device’s GND pin, common ground.
CTS
UC00A’s Clear To
Send pin
This pin is unused under normal UART operation. TTL
level will be determined by Vsel slide switch at ‘G’.
DCD
UC00A’s Data Carrier
Detect pin
This pin is unused under normal UART operation. TTL
level will be determined by Vsel slide switch at ‘G’.
DSR
UC00A’s Data Set
Ready pin
This pin is unused under normal UART operation. TTL
level will be determined by Vsel slide switch at ‘G’.
RI
UC00A’s Ring
Indicator pin
This pin is unused under normal UART operation. TTL
level will be determined by Vsel slide switch at ‘G’.
RX
UC00A’s UART
Receive pin
This is UC00A receiver pin. It should be connected to
target device’s transmitter pin. TTL level will be
determined by Vsel slide switch at ‘G’.
RTS
UC00A’s Request To
Send pin
This pin is unused under normal UART operation. TTL
level will be determined by Vsel slide switch at ‘G’.
DTR
UC00A Data Terminal
Ready pin
This pin is unused under normal UART operation. TTL
level will be determined by Vsel slide switch at ‘G’.
TX
UC00A’s UART
Transmit pin
This is UC00A transmitter pin. It should be connected
to target device’s receiver pin. TTL level will be
determined by Vsel slide switch at ‘G’.
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