SN260 datasheet(27/88 Pages) STMICROELECTRONICS

27 / 88 page

SN260

SPI protocol

27/88

The Length Byte is only included if there is information in the EZSP Frame (EmberZNet

Serial Protocol Frame) and the Length Byte defines the length of just the EZSP Frame.

Therefore, if a command includes an EZSP Frame, the Length Byte can have a value from 2

through 125 and the overall command size will be 5 through 128 bytes. The SPI Byte can be

a specific value indicating if there is an EZSP Frame or not, and if there is an EZSP Frame,

then the Length Byte can be expected.

The Error Byte is used by the error responses to provide additional information about the

error and appears in place of the length byte. This additional information is described in the

following sections.

The EZSP Frame contains the data needed for operating EmberZNet. The EZSP Frame and

its format are explained in Section 7: EmberZNet serial protocol on page 34.

The Frame Terminator is a special control byte used to mark the end of a command. The

Frame Terminator byte is defined as 0xA7 and is appended to all Commands and

Responses immediately after the final data byte. The purpose of the Frame Terminator is to

provide a known byte the SPI Protocol can use to detect a corrupt command. For example, if

the SN260 resets during the Response Section, the Host will still clock out the correct

number of bytes. But when the host attempts to verify the value 0xA7 at the end of the

Response, it will see either the value 0x00 or 0xFF and know that the SN260 just reset and

the corrupt Response should be discarded.

Note:

The Length Byte only specifies the length of the EZSP Frame. It does not include the Frame

Terminator.

6.5

SPI byte

Table 15 lists the possible commands and their responses in the SPI Byte.

Table 15.

SPI commands & responses

Command

value

Command

Response

value

Response

Any

0x00

SN260 reset occurred—This is never used in another response; it

always indicates an SN260 Reset.

Any

0x01

Oversized EZSP Frame received—This is never used in another

response; it always indicates an overflow occurred.

Any

0x02

Aborted Transaction occurred—This is never used in another

response; it always indicates an aborted transaction occurred.

Any

0x03

Missing Frame Terminator—This is never used in another

response; it always indicates a missing frame terminator in the

command.

Any

0x04

Reserved

0x00 – 0x0F

Reserved

[none]

0x0A

SPI Protocol

Version

0x81 – 0xBF

bit[7] is always set. bit[6] is always cleared. bit[5:0] is a number

from 1–63.

0x0B

SPI Status

0xC0 – 0xC1 bit[7] is always set. bit[6] is always set. bit[0]—Set if Alive.

0xF0 – 0xFD

Reserved

[none]

0xFE

EZSP Frame

0xFE

EZSP frame

0xFF

Invalid

0xFF

Invalid

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