XR16L788 Datasheet, PDF (17/42 Pages) Exar Corporation – HIGH PERFORMANCE OCTAL UART

XR16L788 OCTAL UART
REV. 1.1.4
FIGURE 10. INTERNAL LOOP BACK
VCC
Transm it Shift
R e g is te r
M CR bit-4=1
Receive Shift
R e g is te r
VCC
RTS#
CTS#
DTR#
VCC
DSR#
R I#
CD#
OP1#
OP2#
áç
TX [7:0]
RX [7:0]
RTS# [7:0]
CTS# [7:0]
DTR# [7:0]
DSR# [7:0]
RI# [7:0]
CD# [7:0]
4.5 UART CHANNEL CONFIGURATION REGIS-
TERS AND ADDRESS DECODING.
The 8 sets of UART configuration registers are de-
A7
A6
A5
A4
UART CHANNEL
SELECTION
coded using address lines A4 to A7 as show below.
0
0
0
0
0
Address lines A0 to A3 select the 16 registers in each
channel.
0
0
0
1
1
The first 8 registers are 16550 compatible with EXAR
0
0
1
0
2
enhanced feature registers located on the upper 8
0
0
1
1
3
addresses.
0
1
0
0
4
0
1
0
1
5
0
1
1
0
6
0
1
1
1
7
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