what is the difference between ARM cortex M3 and ARM cortex A9

CAN is not part of the core but the SoC. So if the vendor uses the same CAN IP for a CM3 based SoC and a CA9 based one, you can likely re-use the code.

CAN is not part of the core but the SoC. So if the vendor uses the same CAN IP for a CM3 based SoC and a CA9 based one, you can likely re-use the code.

42Bastian Schick said:

CAN is not part of the core but the SoC. So if the vendor uses the same CAN IP for a CM3 based SoC

Tejadeep - The same applies for any Core - whether it's ARM7, Cortex-Mx, or whatever.

For more on the distinction between the Core and the rest of the chip, see:

https://community.arm.com/developer/tools-software/tools/f/keil-forum/43684/lpc2148-timer0-not-working-as-expected/158950#158950