Are you using PSoC4?
For the latest version of SCB, you can check 'Show UART terminals'.
Then enable UART terminal pin's interrupt.
However, may I know why you want to enable RX pin's external interrupt? UART Component has provided some interrupt resources.
In the running mode the pin is used to a SCB uart rx function,however I want to used the pin as a wake up pin when the ship into a DS mode.So the pin must be configured as an external interrupt pin.
I see it..How about checking 'Enable wakeup from Deep Sleep'?
About the 'Enable wakeup from Deep Sleep',I have some question to ask:
1、When I check 'Enable wakeup from Deep Sleep' option,I found that only P30 ,P10can be chosen .
Note The UART rx_wake pin must be placed on a port at which an interrupt is capable of waking the device from Deep Sleep. Refer to the selected device datasheet for more information about ports.
I want to know where the selected device datasheet illustrate which pin can be chosen as a UART rx_wake?
2、If the P30 ,P10 must be used as other function ,how can I achieve to wake up the chip from the deep sleep mode by the UART_rx pin which has been place in the P40?
I think that depends on the internal digital routine resources. The limitation of internal digital routine lead to the access of pins assignment.