RCM3700, HDLC clock

hi all,

sorry I post twice, I need urgent help.

Using RCM3700 board. I try to use HDLC on Port E and output the clock on TCLKE or PG4. Data appears on TXE but clock don’t.

I tried WrPortI(PGFR, &PGFRShadow, 0xFF) after Open() but nothing.
I also tried
BitWrPortI(SECR, &SECRShadow, 1, 4);
BitWrPortI(SECR, &SECRShadow, 1, 3);
BitWrPortI(SECR, &SECRShadow, 1, 2);

Any idea? Nothing appears on TXCLOCK or RXCLOCK !

10x