XR18W750
WIRELESS UART CONTROLLER
REV. 1.0.0
EMSR[1:0]: Receive/Transmit FIFO Level Count (Write-Only)
When Scratchpad Swap (FCTR[6]) is asserted, EMSR bits 1-0 controls what mode the FIFO Level Counter is
operating in.
T ABLE 12: S CRATCHPAD S WAP S ELECTION
FCTR[6] EMSR[1]
EMSR[0] Scratchpad is
0
1
1
1
X
X
0
1
X
0
1
1
Scratchpad
RX FIFO Level Counter Mode
TX FIFO Level Counter Mode
Alternate RX/TX FIFO Counter Mode
During Alternate RX/TX FIFO Level Counter Mode, the first value read after EMSR bits 1-0 have been
asserted will always be the RX FIFO Level Counter. The second value read will correspond with the TX FIFO
Level Counter. The next value will be the RX FIFO Level Counter again, then the TX FIFO Level Counter and
so on and so forth.
EMSR[3:2]: Reserved
For normal operation, these bits should be ’0’.
EMSR[5:4]: Extended RTS Hysteresis
T ABLE 13: A UTO RTS H YSTERESIS
EMSR
B IT -5
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
EMSR
B IT -4
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
FCTR
B IT -1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
FCTR
B IT -0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
RTS#
H YSTERESIS
(C HARACTERS )
0
±4
±6
±8
±8
±16
±24
±32
±40
±44
±48
±52
±12
±20
±28
±36
30
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