參數(shù)資料
型號: XR16L788IQ
廠商: EXAR CORP
元件分類: 微控制器/微處理器
英文描述: HIGH PERFORMANCE OCTAL UART
中文描述: 8 CHANNEL(S), 6.25M bps, SERIAL COMM CONTROLLER, PQFP100
封裝: 14 X 20 MM, 3 MM HEIGHT, PLASTIC, QFP-100
文件頁數(shù): 29/42頁
文件大?。?/td> 557K
代理商: XR16L788IQ
XR16L788 OCTAL UART
á
REV. 1.1.4
29
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.
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.
Table 13
below shows the 16 select-
able hysteresis levels.
T
ABLE
12: A
UTO
RS485 H
ALF
-
DUPLEX
D
IRECTION
C
ONTROL
D
ELAY
FROM
T
RANSMIT
-
TO
-R
ECEIVE
MSR[7]
MSR[6]
MSR[5]
MSR[4]
D
ELAY
IN
D
ATA
B
IT
(
S
) T
IME
0
0
0
0
0
9
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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