How to disconnect the DPI pin from device in SRU?

Question

Hi, 
 I use SRU to connect the DPI pins to the UART: 
 SRU2(UART0_TX_O,DPI_PB14_I); SRU2(DPI_PB13_O,UART0_RX_I); 
 In the next code, I need to connect another DPI pins to the UART, the ADSP-21371 has only one UART, so firstly I need to disconnect DPI 13 and DPI 14 from UART and connect another DPI pins, e.g. DPI 01 and DPI 02. How to do this correctly? 
 Thanks in advance, 
 Afi

ADIApproved · Accepted Answer

Hi Afinko, 
 The ADSP-21368 HRM gives you information on what to do with the unused SRU pins. 
 
 "If a DAI/DPI pin is not being used, the pin enable (for example DAI_PBxx_I ) for its pin buffer should be connected to LOW and its associated bit in the DAI_PIN_PULLUP register should be set (= 1) to enable a 22.5 k Ω pull-up resistor for that pin. "

So for your case, set the bits for 13 and 14 to be high in the DPI_PIN_PULLUP register, tie the pin buffer input to LOW. -> SRU(LOW,DPI_PB14_I) 
 Then you can connect pin 1 and 2 to UART signals.

Hope this helps, 
 Deepa