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MC9S12DP512 Software interrupt within an interrupt service routine

Question asked by Gilbert Gagne on Apr 21, 2009
Latest reply on Apr 22, 2009 by Gilbert Gagne
My program is executing a hardware interrupt reading the serial keypad and I want to turn on the display every time the keypad is pressed. This requires sending a command to the display on the same serial channel.  Trying to generate a transmit interrupt after reading the keypad but before the receive rti instruction executes causes the system to hang up. Is there any way to implement a software interrupt so that after the serial receive hardware interrupt finishes the software interrupt will then use the serial transmitter to turn on the display? My programming is in assembly code.