參數(shù)資料
型號(hào)： XR16M780IL32-F
廠(chǎng)商： Exar Corporation
文件頁(yè)數(shù)： 32/58頁(yè)
文件大?。?/td> 0K
描述： IC UART FIFO 64B 32QFN
標(biāo)準(zhǔn)包裝： 490
特點(diǎn)： *
通道數(shù)： 1，UART
FIFO's： 64 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(lèi)型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 32-QFN 裸露焊盤(pán)（5x5）
包裝： 托盤(pán)
XR16M780
38
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO
REV. 1.0.0
4.12
Enhanced Mode Select Register (EMSR) - Write-only
This register replaces SPR (during a Write) and is accessible only when FCTR[6] = 1.
EMSR[1:0]: Receive/Transmit FIFO Level Count
When Scratchpad Swap (FCTR[6]) is asserted, EMSR bits 1-0 controls what mode the FIFO Level Counter is
operating in.
During Alternate RX/TX FIFO Level Counter Mode, the first value read after EMSR bits 1-0 have been
asserted will always be the RX FIFO Level Counter. The second value read will correspond with the TX FIFO
Level Counter. The next value will be the RX FIFO Level Counter again, then the TX FIFO Level Counter and
so on and so forth.
EMSR[2]: Send TX Immediately
Logic 0 = Do not send TX immediately (default).
Logic 1 = Send TX immediately. When FIFO is enabled and this bit is set, the next data will be written to the
TX shift register. Thus, the data will be sent out immediately instead of queuing in the FIFO. Every time, only
1 byte will be send out. Once this byte has been sent out, the EMSR[2] will go back to 0 automatically. If
more than 1 byte will be sent out, EMSR[2] needs to be set to 1 for each byte.
EMSR[3]: Invert RTS in RS485 mode
Logic 0 = RTS# output is a logic 0 during TX and a logic 1 during RX (default).
Logic 1 = RTS# output is a logic 1 during TX and a logic 0 during RX.
TABLE 12: SCRATCHPAD SWAP SELECTION
FCTR[6] EMSR[1]
EMSR[0] Scratchpad is
0
X
Scratchpad
1
X
0
RX FIFO Level Counter Mode
1
0
1
TX FIFO Level Counter Mode
1
Alternate RX/TX FIFO Counter Mode
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