Hi Steven,
In attachment you could find simple example code for pin (keypad), IRQ and XIRQ example code.
This example code was not created directly for S12G, but behavior should be the same.
STOP mode isn’t implemented in this code but it is simply.
For enter into stop mode you have to clear S bit and execute STOP instruction. For example:
asm ANDCC #0x7F; //clear S bit - enable the stop mode. If the S bit is not
//cleared then STOP instruction has no effect and is
//executed as a dummy instruction NOP.
asm STOP; //STOP mode
Note: Not all interrupts have ability to wake up from stop mode. See Table 1-35. Interrupt Vector Locations in reference manual for more details.
Note: Since clocks are disabled in stop mode, your BDM connection will be interrupted.
Note: Simplest way how to check whether MCU is in stop mode is current consumption measurement or measurement of bus clock. Please use ECLKCTL_NECLK=0; for enabling bus clock at ECLK pin (check your derivative and package for specific routing. In case of S12G, it could be PB0, PS7 or PP1).
More S12G example code could be found here:
https://community.freescale.com/docs/DOC-93792
I hope it helps you.
Have a great day,
RadekS
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