參數(shù)資料
型號(hào)： XR16L570IL32TR-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 4/47頁(yè)
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
電源電壓： 1.62 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
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)
XR16L570
12
SMALLEST 1.62V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
REV. 1.0.1
2.11.1
Receive Holding Register (RHR) - Read-Only
The Receive Holding Register is an 8-bit register that holds a receive data byte from the Receive Shift
Register. It provides the receive data interface to the host processor. The RHR register is part of the receive
FIFO of 16 bytes by 11-bits wide, the 3 extra bits are for the 3 error tags to be reported in LSR register. When
the FIFO is enabled by FCR bit-0, the RHR contains the first data character received by the FIFO. After the
RHR is read, the next character byte is loaded into the RHR and the errors associated with the current data
byte are immediately updated in the LSR bits 2-4.
FIGURE 9. RECEIVER OPERATION IN NON-FIFO MODE
FIGURE 10. RECEIVER OPERATION IN FIFO AND AUTO RTS FLOW CONTROL MODE
Receive Data Shift
Register (RSR)
Receive
Data Byte
and Errors
RHR Interrupt (ISR bit-2)
Receive Data
Holding Register
(RHR)
RXFIFO1
16X Clock
Receive Data Characters
Data Bit
Validation
Error
Tags in
LSR bits
4:2
Receive Data Shift
Register (RSR)
RXFIFO1
16X Clock
E
rror
Tags
(16-sets)
E
rror
Tags
in
LS
R
b
its
4:2
16 bytes by 11-bit
wide
FIFO
Receive Data Characters
FIFO Trigger=8
Example
:
RX FIFO trigger level selected at 8 bytes
Data fills to
14
Data falls to
4
Data Bit
Validation
Receive
Data FIFO
Receive
Data
Receive Data
Byte and Errors
RHR Interrupt (ISR bit-2) programmed for
desired FIFO trigger level.
FIFO is Enabled by FCR bit-0=1
RTS# de-asserts when data fills above the flow
control trigger level to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
RTS# re-asserts when data falls below the flow
control trigger level to restart remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
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