Download XC16x CAN Bootstrap Loader

CAN Bootstrap Loader for XC16x
CAN Bootstrap Loader
No
TwinCAN Module in XC16x
External Host Controller
Initialization of
CAN bootsrtap loader
Prepare CAN communication
defining parameters for initialization
frame
Sample and measure
dominate bus periods
Sending the init. frame and
checking ACK slot
Enough samples and
check the smallest value ?
Successful transmission ?
Calcucate the baud rate and
initialize TwinCAN in analyzer mode
with the detected bit timing
Yes
Error free Init. frame received ?
Yes
Next possible bit timing ?
No
Disable analyzer mode and
dominant bit in the ACK slot is
generated
Init. Phase
Reconfigure TwinCAN
Send the acknow. frame to the host
The acknow. frame received ?
Ack. Phase
Waiting for reception of the next CAN
message
Transmitting CAN message with 8 data
bytes
Restore received data bytes in PSRAM
Last message received ?
Last message transmitted ?
Data Phase
Terminate CAN loader and
execute the loaded code start at
E0,0000h
Figure 2
End of data transfers
Flow Diagram of the CAN Bootstrap Loader
Application Note
14
V 1.1, 2009-01