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EM260
nWAKE
nHOST_INT
nSSEL
5.7.4
Three-Part Transaction: Wake, Get Version, Stack Status Callback
MOSI
0x0A
0xA7
0xFE
0x03
0x00
0x00
0x06
0xA7
MISO
0x82
0xA7
0xFE
0x04
0x00
0x80
0x19
0x91
0xA7
SCLK
Cmd
Wait
Resp
Command
Wait
Response
Figure 12. Timing Diagram of the Three-Part Transaction
1.
2.
3.
4.
5.
6.
7.
8.
9.
Activate nWAKE and activate timeout timer.
EM260 wakes up (if not already) and enables communication.
nHOST_INT asserts, indicating the EM260 can accept commands.
Host sees nHOST_INT activation within 300ms and deactivates nWAKE and timeout timer.
nHOST_INT deasserts 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 0x82 (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 2.
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
0x03 : Length Byte showing the EZSP Frame is 3 bytes long
0x00 : EZSP Sequence Byte (Note that this value should vary based upon previous sequence bytes)
0x00 : EZSP Frame Control Byte indicating a command with no sleeping
0x06 : EZSP Frame ID 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.
Page 33
120-0260-000M Rev 1.1
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