MC68HC908GR16A Datasheet, PDF (183/270 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Exception Control
15.5.1.3 Interrupt Status Registers
The flags in the interrupt status registers identify maskable interrupt sources.
Table 15-3 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 15-3. Interrupt Sources
Interrupt Source
Reset
SWI instruction
IRQ pin
CGM clock monitor
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
Interrupt Status Register 1
Address: $FE04
Bit 7
6
5
4
3
2
1
Bit 0
Read: I6
I5
I4
I3
I2
I1
0
0
Write: R
R
R
R
R
R
R
R
Reset: 0
0
0
0
0
0
0
0
R
= Reserved
Figure 15-12. Interrupt Status Register 1 (INT1)
I6–I1 — Interrupt Flags 1–6
These flags indicate the presence of interrupt requests from the sources shown in Table 15-3.
1 = Interrupt request present
0 = No interrupt request present
Bit 0 and Bit 1 — Always read 0
MC68HC908GR16A Data Sheet, Rev. 1.0
Freescale Semiconductor
183