SN260 datasheet(31/88 Pages) STMICROELECTRONICS

31 / 88 page

SN260

SPI protocol

31/88

Stop transmitting after the number of bytes (length) is received plus the Frame

Terminator.

Decode the response:

–

0xFE

: SPI Byte indicating an EZSP Frame

–

0x02

: Length Byte showing the EZSP Frame is 2 bytes long

–

0x80

: EZSP Frame Control Byte indicating a response with no overflow

–

0x05

: EZSP Frame Type Byte indicating the NOP response

–

0xA7

: Frame Terminator

De-activate Slave Select.

6.7.3

SN260 reset

Figure 10.

SN260 reset example

nHOST_INT asserts.

Activate Slave Select (nSSEL).

Transmit the 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

–

0x06

: EZSP Frame Type Byte indicating the callback command

–

0xA7

: Frame Terminator

Wait for nHOST_INT to assert.

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

Receive response 0x00 (a byte other than 0xFF).

Receive the Error Byte and decode (0x02 is enumerated as RESET_POWERON).

Receive the Frame Terminator (0xA7).

Response 0x00 indicates the SN260 has reset and the Host should respond

appropriately.

10. Deactivate Slave Select.

11. Since nHOST_INT does not assert again, there is no more data for the Host.

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