MC68HC908GP32_08 Datasheet, PDF (167/266 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Exception Control
14.5.1.3 Interrupt Status Registers
The flags in the interrupt status registers identify maskable interrupt sources. Table 14-3 summarizes the
interrupt sources and the interrupt status register flags that they set. The interrupt status registers can be
useful for debugging.
Table 14-3. Interrupt Sources
Priority
Highest
Lowest
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
—
—
IF1
IF2
IF3
IF4
IF5
IF6
IF7
IF8
IF9
IF10
IF11
IF12
IF13
IF14
IF15
IF16
Interrupt Status Register 1
Address: $FE04
Bit 7
6
5
4
3
2
Read: IF6
IF5
IF4
IF3
IF2
IF1
1
Bit 0
0
0
Write: R
R
R
R
R
R
R
R
Reset: 0
0
0
0
0
0
0
0
R
= Reserved
Figure 14-12. Interrupt Status Register 1 (INT1)
IF6–IF1 — Interrupt Flags 1–6
These flags indicate the presence of interrupt requests from the sources shown in Table 14-3.
1 = Interrupt request present
0 = No interrupt request present
MC68HC908GP32 Data Sheet, Rev. 10
Freescale Semiconductor
167