REV. 1.0.0 I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS 1.1.3 SPI Bus Interface The SPI interface consists of four" />
參數(shù)資料
型號: XR20M1280IL40-F
廠商: Exar Corporation
文件頁數(shù): 63/63頁
文件大?。?/td> 0K
描述: IC UART I2C/SPI 128 BYTE 40QFN
產(chǎn)品培訓模塊: UART Product Overview
XR21V141x Full-Speed USB UART Family
標準包裝: 490
通道數(shù): 1,UART
FIFO's: 128 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:
安裝類型: 表面貼裝
封裝/外殼: 40-VFQFN 裸露焊盤
供應商設備封裝: 40-QFN 裸露焊盤(6x6)
包裝: 托盤
其它名稱: 1016-1385
XR20M1280
9
REV. 1.0.0
I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
1.1.3
SPI Bus Interface
The SPI interface consists of four lines: serial clock (SCL), chip select (CS#), slave output (SO) and slave input
(SI). The serial clock, slave output and slave input can be as fast as 26 Mbps. To access the device in the SPI
mode, the CS# signal for the XR20M1280 is asserted by the SPI master, then the SPI master starts toggling
the SCL signal with the appropriate transaction information. The first bit sent by the SPI master includes
whether it is a read or write transaction and the UART register being accessed. See Table 3 below.
TABLE 3: SPI FIRST BYTE FORMAT
BIT
FUNCTION
7
Read/Write#
Logic 1 = Read
Logic 0 = Write
6
Reserved
5:3
UART Internal Register Address A2:A0
2:1
UART Channel Select
’00’ = UART Channel, other values are reserved
0
Reserved
FIGURE 6. SPI WRITE
R /W
‘0 ’
A 2
A 1
A 0
‘0 ’
X
D 7D 6
D 5D 4
D 3D 2
D 1D 0
SC L
SI
FIGURE 7. SPI READ
R/W ‘0’
A2
A1
A0
‘0’
X
D7
D6
D5
D4
D3
D 2
D1
D0
SCL
SI
SO
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