ADUC7126 UART1 & External memory

Question

Hi!
I have a problem with MCU ADUC7126.
I config pin P4.0 as SIN1 and P4.1 as SOUT1 in GP4CON:
0xFFFFF410: 0x00000011
It works, I see recieved and transmit UART1 data.

When I config pin P2.3 as AE (external memory) in GP2CON:
0xFFFFF408: 0x00002022
I read/write external memory data, but I doesn`t recieved data on UART1.
Could you tell me please, what I do wrong?

nikulin · Accepted Answer

The answer on my question has been found: 
 --------------------------------- --------------------------------- --------------------------------- --------------------------------- 
 W hen P4.0 & P4.1 are set up as UART1 pins, it is only possible to receive data when P2.3 is high. 
 P2.3 can be configured as an output or an input, but its level must be high. 
 --------------------------------- --------------------------------- --------------------------------- --------------------------------- 
 ez.analog.com/.../aduc7126-if-it-is-possible-use-dual-uart-with-external-memory-access-enable)

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ADUC7126 UART1 & External memory