參數(shù)資料
型號(hào)： XR16M570IL32TR-F
廠商： Exar Corporation
文件頁數(shù)： 22/50頁
文件大?。?/td> 0K
描述： IC UART FIFO 16B 32QFN
標(biāo)準(zhǔn)包裝： 3,000
特點(diǎn)： *
通道數(shù)： 1，UART
FIFO's： 16 字節(jié)
規(guī)程： RS232，RS422，RS485
電源電壓： 1.62 V ~ 3.63 V
帶自動(dòng)流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 32-QFN 裸露焊盤（5x5）
包裝： 帶卷 (TR)
XR16M570
29
REV. 1.0.1
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 16-BYTE FIFO
4.5
FIFO Control Register (FCR) - Write-Only
This register is used to enable the FIFOs, clear the FIFOs, set the transmit/receive FIFO trigger levels, and
enable the wake up interrupt. They are defined as follows:
FCR[0]: TX and RX FIFO Enable
Logic 0 = Disable the transmit and receive FIFO (default).
Logic 1 = Enable the transmit and receive FIFOs. This bit must be set to logic 1 when other FCR bits are
written or they will not be programmed.
FCR[1]: RX FIFO Reset
This bit is only active when FCR bit-0 is a ‘1’.
Logic 0 = No receive FIFO reset (default)
Logic 1 = Reset the receive FIFO pointers and FIFO level counter logic (the receive shift register is not
cleared or altered). This bit will return to a logic 0 after resetting the FIFO.
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]: Enable wake up interrupt (requires EFR bit-4 = 1)
Logic 0 = Disable the wake up interrupt (default).
Logic 1 = Enable the wake up interrupt.
Please refer to “Section 2.17.3, Wake-up Interrupt” on page 21.
FCR[5:4]: Transmit FIFO Trigger Select (requires EFR bit-4 = 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 9 below shows the selections. Note that the
receiver and the transmitter cannot use different trigger tables. Whichever selection is made last applies to
both the RX and TX side.
FCR[7:6]: Receive FIFO Trigger Select
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 9 shows the complete selections.
Note that the receiver and the transmitter cannot use different trigger tables. Whichever selection is made last
applies to both the RX and TX side.
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