米6体育平台手机版

ZHCS761F December 2011 – May 2017 TRF7962A

PRODUCTION DATA.

封装选项

机械数据 (封装 | 引脚)

RHB|32
- MPQF130D

散热焊盘机械数据 (封装 | 引脚)

RHB|32
- QFND029X

订购信息

6.12.1 General Introduction

The communication interface to the reader can be configured in two ways: with a eight line parallel interface (D0:D7) plus DATA_CLK, or with a 3- or 4-wire Serial Peripheral Interface (SPI). The SPI interface uses traditional master out/slave in (MOSI), master in/slave out (MISO), IRQ, and DATA_CLK lines. The SPI can be operated with or without using the slave select line.

These communication modes are mutually exclusive, which means that only one mode can be used at a time in the application.

When the SPI interface is selected, the unused I/O_2, I/O_1, and I/O_0 pins must be hard-wired according to Table 6-6. At power up, the TRF7962A IC samples the status of these three pins and then enters one of the possible SPI modes in Table 6-6.

samples the status of these three pins. If they are not the same (all high or all low), the IC enters one of the possible SPI modes.

The TRF7962A always behaves as the slave, while the microcontroller (MCU) behaves as the master device. The MCU initiates all communications with the TRF7962A. The TRF7962A makes use of the Interrupt Request (IRQ) pin in both parallel and SPI modes to prompt the MCU for servicing attention.

Table 6-6 Pin Assignment in Parallel and Serial Interface Connection or Direct Mode

PIN	PARALLEL	PARALLEL DIRECT	SPI WITH SS	SPI WITHOUT SS
DATA_CLK	DATA_CLK	DATA_CLK	DATA_CLK from master	DATA_CLK from master
I/O_7	A/D[7]		MOSI⁽¹⁾ = data in (reader in)	MOSI⁽¹⁾ = data in (reader in)
I/O_6	A/D[6]	Direct mode, data out (subcarrier or bit stream)	MISO⁽²⁾ = data out (MCU out)	MISO⁽²⁾ = data out (MCU out)
I/O_5 (3)	A/D[5]	Direct mode, strobe (bit clock out)	See ⁽³⁾	See ⁽³⁾
I/O_4	A/D[4]		SS (slave select)⁽⁴⁾	–
I/O_3	A/D[3]	–	–	–
I/O_2	A/D[2]	–	At VDD	At VDD
I/O_1	A/D[1]	–	At VDD	At VSS
I/O_0	A/D[0]	–	At VSS	At VSS
IRQ	IRQ interrupt	IRQ interrupt	IRQ interrupt	IRQ interrupt

(1) MOSI = Master out, slave in

(2) MISO = Master in, slave out

(3) The I/O_5 pin is used only for information when data is put out of the chip (for example, reading 1 byte from the chip). It is necessary first to write in the address of the register (8 clocks) and then to generate another 8 clocks for reading out the data. The I/O_5 pin goes high during the second 8 clocks. But for normal SPI operations I/O_5 pin is not used.

(4) The slave select pin is active low.

Communication is initialized by a start condition, which is expected to be followed by an Address/Command word (Adr/Cmd). The Adr/Cmd word is 8 bits long, and Table 6-7 describes its format.

Table 6-7 Address/Command Word Bit Distribution

BIT	DESCRIPTION	BIT FUNCTION	ADDRESS	COMMAND
B7	Command control bit	0 = Address 1 = Command	0	1
B6	Read/Write	1 = Read 0 = Write	R/W	0
B5	Continuous address mode	1 = Continuous mode	R/W	0
B4	Address/command bit 4		Adr 4	Cmd 4
B3	Address/command bit 3		Adr 3	Cmd 3
B2	Address/command bit 2		Adr 2	Cmd 2
B1	Address/command bit 1		Adr 1	Cmd 1
B0	Address/command bit 0		Adr 0	Cmd 0

The MSB (bit 7) determines if the word is to be used as a command or as an address. The last two columns of Table 6-7 list the function of the separate bits if either address or command is written. Data is expected once the address word is sent. In continuous address mode (continuous mode = 1), the first data that follows the address is written (or read) to (from) the given address. For each additional data, the address is incremented by one. Continuous mode can be used to write to a block of control registers in a single stream without changing the address; for example, setup of the predefined standard control registers from the MCU nonvolatile memory to the reader. In noncontinuous address mode (simple addressed mode), only one data word is expected after the address.

Address Mode is used to write or read the configuration registers or the FIFO. When writing more than 12 bytes to the FIFO, the Continuous Address Mode should be set to 1.

The Command Mode is used to enter a command that results in reader action (for example, initialize transmission, enable reader, and turn reader on or off).

The following examples show the expected communications between an MCU and the TRF7962A.

Table 6-8 lists the format of a continuous address register read, and Figure 6-5 and Figure 6-6 show examples.

Table 6-8 Continuous Address Mode

Start

Adr x

Data(x)

Data(x+1)

Data(x+2)

Data(x+3)

Data(x+4)

...

Data(x+n)

StopCont

TRF7962A cont_addr_register_write_slos732.png

Figure 6-5 Continuous Address Register Write Example Starting With Register 0x00 (Using SPI With SS Mode)

TRF7962A cont_addr_register_read_slos732.png

Figure 6-6 Continuous Address Register Read Example Starting With Register 0x00 (Using SPI With SS Mode)

Table 6-9 lists the format of a single address register read, and Figure 6-7 and Figure 6-8 show examples.

Table 6-9 Noncontinuous Address Mode (Single Address Mode)

Start

Adr x

Data(x)

Adr y

Data(y)

...

Adr z

Data(z)

StopSgl

TRF7962A single_addr_register_write_slos732.png

Figure 6-7 Single Address Register Write Example of Register 0x00 (Using SPI With SS Mode)

TRF7962A single_addr_register_read_slos732.png

Figure 6-8 Single Address Register Read Example of Register 0x00 (Using SPI With SS Mode)

Table 6-10 lists the format of the direct command mode, and Figure 6-9 shows an example.

Table 6-10 Direct Command Mode

Start

Cmd x

(Optional data or command)

Stop

TRF7962A direct_command_example_slos732.png

Figure 6-9 Direct Command Example of Sending 0x0F (Reset) (Using SPI With SS Mode)

The other Direct Command Codes from MCU to TRF7962A are described in Section 6.13.