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參數(shù)資料
型號: XR20M1172IL32-F
廠商: Exar Corporation
文件頁數(shù): 24/55頁
文件大小: 0K
描述: IC UART FIFO I2C/SPI 64B 32QFN
標準包裝: 490
特點: *
通道數(shù): 2,DUART
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 1.62 V ~ 3.63 V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
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: 32-VFQFN 裸露焊盤
供應商設備封裝: 32-QFN 裸露焊盤(5x5)
包裝: 托盤
其它名稱: 1016-1477
XR20M1172IL32-F-ND
XR20M1172
30
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO
REV. 1.2.0
]
ISR[0]: Interrupt Status
Logic 0 = An interrupt is pending and the ISR contents may be used as a pointer to the appropriate interrupt
service routine.
Logic 1 = No interrupt pending (default condition).
ISR[3:1]: Interrupt Status
These bits indicate the source for a pending interrupt at interrupt priority levels (See Interrupt Source Table 9).
ISR[4]: Xoff/Xon or Special Character Interrupt Status
This bit is set when EFR[4] = 1 and IER[5] = 1. ISR bit-4 indicates that the receiver detected a data match of
the Xoff character(s). If this is an Xoff interrupt, it is cleared when XON is received. If it is a special character
interrupt, it is cleared by reading ISR.
ISR[5]: RTS#/CTS# Interrupt Status
This bit is enabled when EFR[4] = 1. ISR bit-5 indicates that the CTS# or RTS# has been de-asserted.
ISR[7:6]: FIFO Enable Status
In Non-FIFO Mode, these bits are a logic 0. In FIFO Mode, these bits are a logic 1.
4.5
FIFO Control Register (FCR) - Write-Only
This register is used to enable the FIFOs, clear the FIFOs and set the transmit/receive FIFO trigger levels.
FCR[0]: TX and RX FIFO Enable
Logic 0 = Non-FIFO Mode (default). Transmit and receive FIFOs disabled for 16450 compatibility. For
normal operation, the FIFO Mode must be enabled.
Logic 1 = FIFO Mode. Enable the transmit and receive FIFOs. This bit must be set to a logic 1 when other
FCR bits are written or they will not be programmed.
TABLE 9: INTERRUPT SOURCE AND PRIORITY LEVEL
PRIORITY
ISR REGISTER STATUS BITS
SOURCE OF INTERRUPT
LEVEL
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
1
0
1
0
LSR (Receiver Line Status Register)
2
0
1
0
RXRDY (Receive Data Time-out)
3
0
1
0
RXRDY (Received Data Ready)
4
0
1
0
TXRDY (Transmit Ready)
5
0
MSR (Modem Status Register)
6
1
0
GPIO (General Purpose Inputs)
7
0
1
0
RXRDY (Received Xoff or Special character)
8
1
0
CTS#, RTS# change of state
-
0
1
None (default)
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