REV. 1.1.0 I2C/SPI UART WITH 64-BYTE FIFO 2.1.2 SPI Bus Interface The SPI interface consists of four lines: serial clock (SCL), chi" />
參數(shù)資料
型號: XR20M1170IL24-F
廠商: Exar Corporation
文件頁數(shù): 56/56頁
文件大?。?/td> 0K
描述: IC UART FIFO I2C/SPI 64B 24QFN
標(biāo)準(zhǔn)包裝: 490
特點: *
通道數(shù): 1,UART
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 2.25 V ~ 3.6 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: 24-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 24-QFN 裸露焊盤(4x4)
包裝: 托盤
其它名稱: 1016-1476
XR20M1170IL24-F-ND
XR20M1170
9
REV. 1.1.0
I2C/SPI UART WITH 64-BYTE FIFO
2.1.2
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 18 MHz at 3.3V. To access the device in
the SPI mode, the CS# signal for the M1170 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
6:3
UART Internal Register Address A3:A0
2:1
UART Channel Select
’00’ = UART Channel A, other values are reserved
0
Reserved
FIGURE 7. SPI WRITE
R/W A3 A2 A1 A0
0
X
D7 D6 D5 D4 D3 D2 D1 D0
SCLK
SI
FIGURE 8. SPI READ
R/W A3A2A1A0
0
X
D7 D6 D5 D4 D3 D2 D1 D0
SCLK
SI
SO
The 64 byte TX FIFO can be loaded with data or 64 byte RX FIFO data can be unloaded in one SPI write or
read sequence.
FIGURE 9. SPI FIFO WRITE
R /W A 3
A 2
A 1
A 0
0
X
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D 3
D 2
D 1
D 0
SC L K
SO
la s t b it
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