XR16L788 Exar Corporation, XR16L788 Datasheet - Page 29

• Manufacturer Part Number: XR16L788
• Description: High-performance 3.3V Octal Uart
• Manufacturer: Exar Corporation

XR16L788 OCTAL UART
REV. 1.1.4
SCRATCH PAD REGISTER (SPR)
This is a 8-bit general purpose register for the user to
store temporary data. The content of this register is
preserved during sleep mode but becomes 0xFF (de-
fault) after a reset or a power off-on cycle.
FEATURE CONTROL REGISTER (FCTR)
This register controls the UART enhanced functions
that are not available on ST16C554 or ST16C654.
T
ABLE
12: A
UTO
MSR[7]
RS485 H
0
0
0
0
0
9
0
0
1
1
1
1
1
1
1
1
MSR[6]
ALF
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
-
DUPLEX
MSR[5]
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D
IRECTION
MSR[4]
29
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
FCTR [3:0] - Auto RTS/DTR Flow Control Hystere-
sis Select
These bits select the auto RTS/DTR flow control hys-
teresis and only valid when TX and RX Trigger Table-
D is selected (FCTR bit-6 and 7 are set to logic 1).
The RTS/DTR hysteresis is referenced to the RX
FIFO trigger level. After reset, these bits are set to
logic 0 selecting the next FIFO trigger level for hard-
ware flow control.
able hysteresis levels.
C
ONTROL
D
ELAY IN
D
ELAY FROM
D
ATA
10
12
13
14
15
11
0
1
2
3
4
5
6
7
8
9
Table 13
B
IT
T
(
S
RANSMIT
) T
below shows the 16 select-
IME
-
TO
-R
ECEIVE