參數(shù)資料
型號(hào)： TRF7960RHBT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁(yè)數(shù)： 35/52頁(yè)
文件大?。?/td> 1023K
代理商： TRF7960RHBT
b7
b6
b5
b4
b3
b2
b1
b0
Start
Condition
Stop
Condition
SCLK
DataIN
DataOut
50ns
SLOU186F – AUGUST 2006 – REVISED AUGUST 2010
www.ti.com
5.7
Serial Interface Communication
When an SPI interface is required, parallel I/O pins, I/O_2, I/O_1, and I/O_0, must be hard wired
according to Table 5-31. On power up, the reader looks for the status of these pins; if they are not the
same (not all high, or not all low), the reader enters into one of two possible SPI modes.
The serial communications work in the same manner as the parallel communications with respect to the
FIFO, except for the following condition. On receiving an IRQ from the reader, the MCU reads the reader's
IRQ register to determine how to service the reader. After this, the MCU must to do a dummy read to clear
the reader's IRQ status register. The dummy read is required in SPI mode because the reader's IRQ
status register needs an additional clock cycle to clear the register. This is not required in parallel mode
because the additional clock cycle is included in the Stop condition.
A procedure for a dummy read is as follows:
A. Starting the dummy read:
(a) When using slave select (SS): set SS bit low.
(b) When not using SS: start condition is when SCLK is high (See Table 5-30).
B. Send address word to IRQ status register (0Ch) with read and continuous address mode bits set to 1
C. Read 1 byte (8 bits) from IRQ status register (0Ch).
D. Dummy-read 1 byte from register 0Dh (collision position and interrupt mask).
E. Stopping the dummy read:
(a) When using slave select (SS): set SS bit high.
(b) When not using SS: stop condition when SCLK is high (See Table 5-30).
5.7.1
SPI Interface Without SS* (Slave Select) Pin
The serial interface without the slave select pin must use delimiters for the start and stop conditions.
Between these delimiters, the address, data, and command words can be transferred. All words must be 8
bits long with MSB transmitted first.
Figure 5-8. Serial – SPI Interface Communication (No SS* Pin)
In this mode, a rising edge on data-in (I/O_7, pin 24) while SCLK is high resets the serial interface and
prepares it to receive data. Data-in can change only when SCLK is low and is taken by the reader on the
SCLK rising edge. Communication is terminated by the stop condition when the data-in falling edge occurs
during a high SCLK period.
5.7.2
SPI Interface With SS* (Slave Select) Pin
The serial interface is in reset while the SS* signal is high. Serial data-in (MOSI) changes on the falling
edge, and is validated in the reader on the rising edge, as shown in Figure 5-9. Communication is
terminated when the SS* signal goes high.
All words must be 8 bits long with the MSB transmitted first.
40
System Description
Copyright 2006–2010, Texas Instruments Incorporated
Product Folder Link(s): TRF7960 TRF7961
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TRF7960RHBT 制造商:Texas Instruments 功能描述:RFID Reader IC 制造商:Texas Instruments 功能描述:IC, RFID READER, 13.56MHZ, QFN-32
TRF7960RHBTG4 功能描述:RFID應(yīng)答器 Mulit-Standard High Freq RFID Read/Writ RoHS:否 制造商:Murata 存儲(chǔ)容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel
TRF7960TB 功能描述:射頻識(shí)別變換器工具 TRF7960 Target Board RoHS:否 制造商:Olimex Ltd. 產(chǎn)品:RFID Readers 用于:ISO15693
TRF7961 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Multi-Standard Fully Integrated 13.56-MHz Radio Frequency Identification (RFID) Analog Front End and Data Framing Reader System
TRF7961RHBR 功能描述:RFID應(yīng)答器 Multi-Standard High Freq RFid Reader RoHS:否 制造商:Murata 存儲(chǔ)容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel
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