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AM3892 register INTCPS_ILR field PRIORITY misses top bit when written/read

Hi,

We see a weird effect when accessing the chip with CCSv5+XDS510 and manipulating this register.

TRM Table 12-23. INTCPS_ILRm Register Field Descriptions

According to documentation, the maximum value I can write in this register is 0x1FD (where 0x1FC is lowest priority and 1 is FIQ turning on).
But currently when I’m trying to write this value (0x1FD) in INTCPS_ILR0-127 registers I see just 0xFD. Looks like 8-th bit is read only.

Please advice what can be the reason.

/Magnus