SN260 datasheet(38/88 Pages) STMICROELECTRONICS

38 / 88 page

EmberZNet serial protocol

SN260

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7.2.8

SN260 status

The frame control byte of every response sent by the SN260 contains two status bits:

●

The overflow bit is set if the SN260 ran out of memory at any time since the previous

response was sent. If this bit is set, then messages may have been lost.

●

The truncated bit is set if the SN260 truncated the current response. If this bit is set, the

command from the Host produced a response larger than the maximum EZSP frame

length.

You can use the nop command to check the status of the SN260 without also performing

another action.

7.2.9

Random number generator

The Host can obtain a random number from the SN260 using the getRandomNumber

command. The random number is generated from analog noise in the radio and can be

used to seed a random number generator on the Host.

7.3

Protocol format

All EZSP frames begin with a frame control byte. Table 18 describes the meaning of this

byte for command and response frames. Table 19 describes the sleep modes, Table 20

describes the overflow status bit and Table 21 describes the truncated status bit. The

second byte of all EZSP frames is the frame ID byte.

Table 18.

Frame control byte

Bit

Command

Response

7 (MSB)

0 (reserved)

sleepMode[1]

truncated

0 (LSB)

sleepMode[0]

overflow

Table 19.

Sleep modes

sleepMode[1]

sleepMode[0]

Description

Reserved.

Power down.

Deep sleep.

Idle.

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