CYRF69213(2007) データシートの表示（PDF） - Cypress Semiconductor

部品番号

コンポーネント説明

メーカー

CYRF69213
(Rev.:2007)

Programmable Radio on Chip Low Power

Cypress Semiconductor 

CYRF69213

An RSSI reading is taken automatically when the start of a

packet is detected. In addition, a new RSSI reading is taken

every time the previous reading is read from the RSSI register,

allowing the background RF energy level on any given channel

to be easily measured when RSSI is read when no signal is

being received. A new reading can occur as fast as once every

12 µs.

SPI Interface

The SPI interface between the MCU function and the radio

function is a 3-wire SPI Interface. The three pins are MOSI

(Master Out Slave In), SCK (Serial Clock), SS (Slave Select).

There is an alternate 4-wire MISO Interface that requires the

connection of two external pins. The SPI interface is controlled

by configuring the SPI Configure Register (SICR Address:

0x3D).

3-Wire SPI Interface

The radio function receives a clock from the MCU function on

the SCK pin. The MOSI pin is multiplexed with the MISO pin.

Bidirectional data transfer takes place between the MCU

function and the radio function through this multiplexed MOSI

pin. When using this mode the user firmware should ensure

that the MOSI pin on the MCU function is in a high impedance

state, except when the MCU is actively transmitting data.

Firmware must also control the direction of data flow and

switch directions between MCU function and radio function by

setting the SWAP bit [Bit 7] of the SPI Configure Register. The

SS pin is asserted prior to initiating a data transfer between the

MCU function and the radio function. The IRQ function may be

optionally multiplexed with the MOSI pin; when this option is

enabled the IRQ function is not available while the SS pin is

low. When using this configuration, user firmware should

ensure that the MOSI function on MCU function is in a

high-impedance state whenever SS is high.

Figure 4. 3-Wire SPI Mode

MCU Function

Radio Function

P1.5/MOSI

MOSI

MOSI/MISO multiplexed

on one MOSI pin

P1.4/SCK

SCK

P1.3/nSS

nSS

4-Wire SPI Interface

The 4-wire SPI communications interface consists of MOSI,

MISO, SCK, and SS.

The device receives SCK from the MCU function on the SCK

pin. Data from the MCU function is shifted in on the MOSI pin.

Data to the MCU function is shifted out on the MISO pin. The

active low SS pin must be asserted for the two functions to

communicate. The IRQ function may be optionally multiplexed

with the MOSI pin; when this option is enabled the IRQ

function is not available while the SS pin is low. When using

this configuration, user firmware should ensure that the MOSI

function on MCU function is in a high-impedance state

whenever SS is high.

Figure 5. 4-WIRE SPI Mode

MCU Function

P1.6/MISO

P1.5/MOSI

P1.4/SCK

P1.3/nSS

Radio Function

MOSI

SCK

MISO

nSS

This connection is external to the PRoC LP Chip

SPI Communication and Transactions

The SPI transactions can be single byte or multi-byte. The

MCU function initiates a data transfer through a

Command/Address byte. The following bytes are data bytes.

The SPI transaction format is shown in Figure 6.

The DIR bit specifies the direction of data transfer. 0 = Master

reads from slave. 1 = Master writes to slave.

The INC bit helps to read or write consecutive bytes from

contiguous memory locations in a single burst mode

operation.

If Slave Select is asserted and INC = 1, then the master MCU

function reads a byte from the radio, the address is incre-

mented by a byte location, and then the byte at that location is

read, and so on.

If Slave Select is asserted and INC = 0, then the MCU function

reads/writes the bytes in the same register in burst mode, but

if it is a register file then it reads/writes the bytes in that register

file.

The SPI interface between the radio function and the MCU is

not dependent on the internal 12-MHz oscillator of the radio.

Therefore, radio function registers can be read from or written

into while the radio is in sleep mode.

SPI IO Voltage References

The SPI interfaces between MCU function and the radio and

the IRQ and RST have a separate voltage reference VIO,

enabling the radio function to directly interface with the MCU

Document #: 001-07552 Rev. *B

Page 8 of 85

[+] Feedback

Share Link: