SPC560P34x, SPC560P40x

Hardware configuration to select boot mode

Doc ID 022359 Rev 2

7/11

Then continuously waits in polling on change of RX pins level.The FlexCAN RX pin level

takes precedence. First signal found at low level selects the serial boot routine that will be

executed.

In case a low level is detected on any input, the corresponding autobaud measurement

functionality is started:

●

when FlexCAN RX (corresponds to pin B[1]) level is low, the CAN autobaud

measurement starts and then sets up the FlexCAN baud rate accordingly;

●

when UART RX (corresponds to pin B[3] on LQFP100 or B[7] on LQFP64) level is low,

the UART autobaud measurement starts and then sets up the LINFlex baud rate

accordingly.

After performing the autobaud measurement and setting up the baud rate, the

corresponding RX input is reconfigured and the related standard download process is

started; in case of a detected CAN transmission a download using the CAN protocol as

described in section “Bootstrap with FlexCAN— autobaud disabled”of RM0046, rev. 3 (see

Section Appendix A), and in case of a detected UART transmission a download using the

UART protocol as described in Section” Boot from UART— autobaud disabled” of RM0046,

rev.3 (see Section Appendix A).

The following Figure 1 identifies the corresponding flow and steps.

Note:

When autobaud scan is selected, initially both LINFlex_0 RX pin and FlexCAN_0 RX pin

should be at high level. No external circuity should pull-down them to allow right autoscan.