SN260 datasheet(30/88 Pages) STMICROELECTRONICS

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SPI protocol

SN260

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6.7.1

SPI protocol version

Figure 8.

SPI protocol version example

Activate Slave Select (nSSEL).

Transmit the command 0x0A - SPI Protocol Version Request.

Transmit the Frame Terminator, 0xA7.

Wait for nHOST_INT to assert.

Transmit and receive 0xFF until a byte other than 0xFF is received.

Receive response 0x81 (a byte other than 0xFF), then receive the Frame Terminator,

0xA7

Bit 7 is always set and bit 6 is always cleared in the Version Response, so this is

Version 1.

De-activate Slave Select.

6.7.2

EmberZNet serial protocol frame — NOP command

Figure 9.

EmberZNet serial protocol frame - NOP command example

Activate Slave Select (nSSEL).

Transmit the appropriate command:

–

0xFE

: SPI Byte indicating an EZSP Frame

–

0x02

: Length Byte showing the EZSP Frame is 2 bytes long

–

0x00

: EZSP Frame Control Byte indicating a command with no sleeping

–

0x05

: EZSP Frame Type Byte indicating the NOP command

–

0xA7

: Frame Terminator

Wait for nHOST_INT to assert.

Transmit and receive 0xFF until a byte other than 0xFF is received.

Receive response 0xFE (a byte other than 0xFF) and read the next byte for a length.

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