MC68HC908GP20 Datasheet, PDF (302/406 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

19.6.1.2 SWI Instruction
The SWI instruction is a non-maskable instruction that causes an
interrupt regardless of the state of the interrupt mask (I bit) in the
condition code register.
NOTE: A software interrupt pushes PC onto the stack. A software interrupt does
not push PC – 1, as a hardware interrupt does.
19.6.1.3 Interrupt Status Registers
The flags in the interrupt status registers identify maskable interrupt
sources. Table 19-3 summarizes the interrupt sources and the interrupt
status register flags that they set. The interrupt status registers can be
useful for debugging.
Priority
Highest
Lowest
Table 19-3. Interrupt Sources
Interrupt Source
Reset
SWI instruction
IRQ pin
PLL
TIM1 channel 0
TIM1 channel 1
TIM1 overflow
TIM2 channel 0
TIM2 channel 1
TIM2 overflow
SPI receiver full
SPI transmitter empty
SCI receive error
SCI receive
SCI transmit
Keyboard
ADC conversion complete
Timebase module
Interrupt Status
Register Flag
—
—
I1
I2
I3
I4
I5
I6
I7
I8
I9
I10
I11
I12
I13
I14
I15
I16
Advance Information
302
MC68HC908GP20 — Rev 2.1
Freescale Semiconductor