參數(shù)資料
型號(hào)： XR17V254IV-0A-EVB
廠商： Exar Corporation
文件頁(yè)數(shù)： 25/70頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR17V254 144LQFP
標(biāo)準(zhǔn)包裝： 1
系列： *
XR17V254
31
REV. 1.0.1
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
4.2
Automatic Hardware (RTS/CTS or DTR/DSR) Flow Control Operation
Automatic hardware or RTS/DTR and CTS/DSR flow control is used to prevent data overrun to the local
receiver FIFO and remote receiver FIFO. The RTS#/DTR# output pin is used to request remote unit to
suspend/restart data transmission while the CTS#/DSR# input pin is monitored to suspend/restart local
transmitter. The auto RTS/DTR and auto CTS/DSR flow control features are individually selected to fit specific
application requirement and enabled through EFR bit[6:7] and MCR bit [2] for either RTS/CTS or DTR/DSR
control signals. The auto RTS/DTR function must be started by asserting RTS/DTR# output pin (MCR bit [0] or
bit [1] to logic 1) after it is enabled. Figure 12 below explains how it works.
Two interrupts associated with RTS/DTR and CTS/DSR flow control have been added to give indication when
RTS/DTR# pin or CTS/DSR# pin is de-asserted during operation. The RTS/DTR and CTS/DSR interrupts must
be first enabled by EFR bit [4], and then enabled individually by IER bits [7:6], and chosen with MCR bit [2].
Automatic hardware flow control is selected by setting bits [7 (CTS): 6 (RTS)] of the EFR register to logic 1. If
CTS# pin transitions from LOW to HIGH indicating a flow control request, ISR bit [5] will be set to logic 1, (if
enabled via IER bit [7:6]), and the UART will suspend TX transmissions as soon as the stop bit of the character
in process is shifted out. Transmission is resumed after the CTS# input returns to LOW, indicating more data
may be sent.
400000
3.75
3 12/16
0
3
C
0
460800
3.2552
3 4/16
0
3
4
0.16
500000
3
0
3
0
750000
2
0
2
0
921600
1.6276
1 10/16
0
1
A
0.16
1000000
1.5
1 8/16
0
1
8
0
TABLE 12: TYPICAL DATA RATES WITH A 24 MHZ CRYSTAL OR EXTERNAL CLOCK AT 16X SAMPLING
REQUIRED
OUTPUT DATA
RATE
DIVISOR FOR
16x Clock
(Decimal)
DIVISOR
OBTAINABLE IN
V254
DLM PROGRAM
VALUE (HEX)
DLL PROGRAM
VALUE (HEX)
DLD PROGRAM
VALUE (HEX))
DATA ERROR
RATE (%)
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XR17V258 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT
XR17V258_08 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT
XR17V258IV 功能描述:UART 接口集成電路 66MHz Octal PCI UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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