REV. 2.3.1 18 2.14 Auto RTS (Hardware) Flow Control Automatic RTS hardware flow" />
參數(shù)資料
型號: XR16C850CMTR-F
廠商: Exar Corporation
文件頁數(shù): 10/56頁
文件大?。?/td> 0K
描述: IC UART FIFO 128B 48TQFP
標準包裝: 1,500
特點: *
通道數(shù): 1,UART
FIFO's: 128 字節(jié)
規(guī)程: RS485
電源電壓: 2.97 V ~ 5.5 V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶調制解調器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 48-TQFP
供應商設備封裝: 48-TQFP(7x7)
包裝: 帶卷 (TR)
XR16C850
xr
2.97V TO 5.5V UART WITH 128-BYTE FIFO
REV. 2.3.1
18
2.14
Auto RTS (Hardware) Flow Control
Automatic RTS hardware flow control is used to prevent data overrun to the local receiver FIFO. The RTS#
output is used to request remote unit to suspend/resume data transmission. The auto RTS flow control
features is enabled to fit specific application requirement (see Figure 13):
Enable auto RTS flow control using EFR bit-6.
The auto RTS function must be started by asserting RTS# output pin (MCR bit-1 to logic 1 after it is enabled).
Enable RTS interrupt through IER bit-6 (after setting EFR bit-4). The UART issues an interrupt when the
RTS# pin makes a transition from low to high: ISR bit-5 will be set to logic 1.
2.15
Auto RTS Hysteresis
The 850 has a new feature that provides flow control trigger hysteresis while it maintains compatibility to
16C650A and 16C550. With the Auto RTS function enabled, an interrupt is generated when the receive FIFO
reaches the programmed RX trigger level. The RTS# pin will not be forced to a logic 1 (RTS off), until the
receive FIFO reaches the upper limit of the hysteresis level. The RTS# pin will return to a logic 0 after the RX
FIFO is unloaded to the lower limit of the hysteresis level. Under the above described conditions, the 850 will
continue to accept data until the receive FIFO gets full. The Auto RTS function is initiated when the RTS#
output pin is asserted to a logic 0 (RTS On). For complete details, see Table 5.
TABLE 5: AUTO RTS HYSTERESIS
TRIGGER TABLE SELECTED
(SEE TABLE 10)
FCTR
BIT-1
FCTR
BIT-0
TRIGGER LEVEL
(CHARACTERS)
RTS
HYSTERESIS
(CHARACTERS)
INT PIN
ACTIVATION
RTS#
DE-ASSERTED
(CHARACTERS)
RTS#
ASSERTED
(CHARACTERS)
Trigger Table-A
0
1
-
1
4
0
4
-
4
8
1
0
8
-
8
14
4
0
14
-
14
8
Trigger Table-B
0
8
-
8
16
0
16
-
16
24
8
0
24
-
24
28
16
0
28
-
28
24
Trigger Table-C
0
8
-
8
16
0
16
-
16
56
8
0
56
-
56
60
16
0
60
-
60
56
Trigger Table-D
(Programmable)
0
1
N
±4
N
N + 4
N - 4
1
0
N
±6
N
N + 6
N - 6
1
N
±8
N
N + 8
N - 8
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