參數(shù)資料
型號(hào)： XR16L784CVTR-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 32/51頁(yè)
文件大?。?/td> 0K
描述： IC UART FIFO 64B QUAD 64LQFP
標(biāo)準(zhǔn)包裝： 1,000
特點(diǎn)： *
通道數(shù)： 4，QUART
FIFO's： 64 字節(jié)
規(guī)程： RS485
電源電壓： 2.97 V ~ 5.5 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
安裝類型： 表面貼裝
封裝/外殼： 64-LQFP
供應(yīng)商設(shè)備封裝： 64-LQFP（10x10）
包裝： 帶卷 (TR)
XR16L784
38
HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
REV. 1.2.3
4.13
Enhanced Feature Register (EFR) - Read/Write
Enhanced features are enabled or disabled using this register. Bit 0-3 provide single or dual consecutive
character software flow control selection (see Table 18). When the Xon1 and Xon2 and Xoff1 and Xoff2 modes
are selected, the double 8-bit words are concatenated into two sequential characters. Caution: note that
whenever changing the TX or RX flow control bits, always reset all bits back to logic 0 (disable) before
programming a new setting.
EFR[3:0]: Software Flow Control Select
Combinations of software flow control can be selected by programming these bits.
EFR[4]: Enhanced Function Bits Enable
Enhanced function control bit. This bit enables the functions in IER bits 4-7, ISR bits 4-5, FCR bits 4-5, and
MCR bits 5-7 to be modified. After modifying any enhanced bits, EFR bit-4 can be set to a logic 0 to latch the
new values. This feature prevents legacy software from altering or overwriting the enhanced functions once
set. Normally, it is recommended to leave it enabled, logic 1.
Logic 0 = modification disable/latch enhanced features. IER bits 4-7, ISR bits 4-5, FCR bits 4-5, and MCR
bits 5-7 are saved to retain the user settings. After a reset, the IER bits 4-7, ISR bits 4-5, FCR bits 4-5, and
MCR bits 5-7 are set to a logic 0 to be compatible with ST16C554 mode (default).
Logic 1 = Enables the enhanced functions. When this bit is set to a logic 1 all enhanced features are
enabled.
TABLE 18: SOFTWARE FLOW CONTROL FUNCTIONS
EFR BIT-3
CONT-3
EFR BIT-2
CONT-2
EFR BIT-1
CONT-1
EFR BIT-0
CONT-0
TRANSMIT AND RECEIVE SOFTWARE FLOW CONTROL
0
No TX and RX flow control (default and reset)
0
X
No transmit flow control
1
0
X
Transmit Xon1/Xoff1
0
1
X
Transmit Xon2/Xoff2
1
X
Transmit Xon1 and Xon2/Xoff1 and Xoff2
X
0
No receive flow control
X
1
0
Receiver compares Xon1/Xoff1
X
0
1
Receiver compares Xon2/Xoff2
1
0
1
Transmit Xon1/ Xoff1,
Receiver compares Xon1 or Xon2, Xoff1 or Xoff2
0
1
Transmit Xon2/Xoff2,
Receiver compares Xon1 or Xon2, Xoff1 or Xoff2
1
Transmit Xon1 and Xon2/Xoff1 and Xoff2,
Receiver compares Xon1 and Xon2/Xoff1 and Xoff2
0
1
No transmit flow control,
Receiver compares Xon1 and Xon2/Xoff1 and Xoff2
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