REV. 1.4.2 FCR[2]: TX FIFO Reset This bit is only active when FCR bit-0" />
參數(shù)資料
型號: XR16L580IMTR-F
廠商: Exar Corporation
文件頁數(shù): 21/49頁
文件大?。?/td> 0K
描述: IC UART FIFO 16B 48TQFP
標(biāo)準(zhǔn)包裝: 1,500
特點(diǎn): *
通道數(shù): 1,UART
FIFO's: 16 字節(jié)
規(guī)程: RS232,RS422
電源電壓: 2.25 V ~ 5.5 V
帶自動(dòng)流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動(dòng)位檢測功能:
帶調(diào)制解調(diào)器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 48-TQFP
供應(yīng)商設(shè)備封裝: 48-TQFP(7x7)
包裝: 帶卷 (TR)
XR16L580
28
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
REV. 1.4.2
FCR[2]: TX FIFO Reset
This bit is only active when FCR bit-0 is a ‘1’.
Logic 0 = No transmit FIFO reset (default).
Logic 1 = Reset the transmit FIFO pointers and FIFO level counter logic (the transmit shift register is not
cleared or altered). This bit will return to a logic 0 after resetting the FIFO.
FCR[3]: DMA Mode Select (Legacy)
This bit has no function and should be left at ’0’.
FCR[5:4]: Transmit FIFO Trigger Select
(’00’ = default, TX trigger level = 1)
These 2 bits set the trigger level for the transmit FIFO. The UART will issue a transmit interrupt when the
number of characters in the FIFO falls below the selected trigger level, or when it gets empty in case that the
FIFO did not get filled over the trigger level on last re-load.
Table 8 below shows the selections. EFR bit-4 must
be set to ‘1’ before these bits can be accessed.
FCR[7:6]: Receive FIFO Trigger Select
(’00’ = default, RX trigger level =1)
These 2 bits are used to set the trigger level for the receive FIFO. The UART will issue a receive interrupt when
the number of the characters in the FIFO crosses the trigger level.
Table 8 shows the selections.
TABLE 8: TRANSMIT AND RECEIVE FIFO TRIGGER LEVEL SELECTION
BIT-7
BIT-6
BIT-5
BIT
-4
RECEIVE
TRIGGER LEVEL
TRANSMIT
TRIGGER LEVEL
COMPATIBILITY
0
1
0
1
0
1
1 (default)
4
8
14
16C580 and 16L580 compati-
ble.
0
1
0
1
0
1
1 (default)
4
8
14
16C550, 16C580, 16C554,
16C2550 and 16C2552 compat-
ible
4.7
Line Control Register (LCR) - Read/Write
The Line Control Register is used to specify the asynchronous data communication format. The word or
character length, the number of stop bits, and the parity are selected by writing the appropriate bits in this
register.
LCR[1:0]: TX and RX Word Length Select
These two bits specify the word length to be transmitted or received.
WORD LENGTH
0
5 (default)
0
1
6
1
0
7
1
8
FCR
BIT-1
BIT-0
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