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TL16C750 UART

We are not seeing a write to UART FCR register bit 5.  How do you recommend writing to this bit.  Is the sequence:

 

LCR = 0x80

FCR = 1

FCR = 0x21

 

Correct to get the bit 5 set?

 

We are also writing to bits 6 and 7 of FCR.  These do not require LCR to be set, correct?

 

Here we are doing

FCR = 0xF1

1 msec delay

FCR = 0xF7

 

I don’t think the above top sequence is correct.  We are reading register #2 (IIR) and it is giving a 0x12??