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CCS/AM5728: PRU cycle counter issue

Part Number: AM5728

Tool/software: Code Composer Studio

Hello .I am using pru cycle counter . I enable the counter by

PRU0_CTRL.CONTROL_bit.COUNTER_ENABLE=0x1;

and when CYCLECOUNT reaches its maxmum value(0xFFFF FFFF)

COUNTER_ENABLE will automatically set to 0 .

which is correct as the TRM said.But even if I reset COUNTER_ENABLE to 1, CYCLECOUNT set to 0, the CYCLECOUT won't count any more(remains 0 forever). I wanna know why .Thanks ahead.