SN260 datasheet(32/88 Pages) STMICROELECTRONICS

32 / 88 page

SPI protocol

SN260

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6.7.4

Three-part transaction: Wake, Get Version, Stack Status Callback

Figure 11.

Timing diagram of the three-part transaction

Activate nWAKE and activate timeout timer.

SN260 wakes up (if not already) awake and enables communication.

nHOST_INT asserts, indicating the SN260 can accept commands.

Host sees nHOST_INT activation within 10ms and deactivates nWAKE and timeout

timer.

nHOST_INT de-asserts immediately after nWAKE.

Activate Slave Select.

Transmit the Command 0x0A - SPI Protocol Version Request.

Transmit the Frame Terminator, 0xA7.

Wait for nHOST_INT to assert.

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

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

0xA7

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

Version 1.

13. Deactivate Slave Select.

14. Host begins timing the inter-command spacing of 1ms in preparation for sending the

next command.

15. nHOST_INT asserts shortly after deactivating Slave Select, indicating a callback.

16. Host sees nHOST_INT, but waits for the 1ms before responding.

17. Activate Slave Select.

18. 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

19. Wait for nHOST_INT to assert.

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

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

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

Terminator.

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