MC68HC908GR8A_07 Datasheet, PDF (167/260 Pages) Freescale Semiconductor, Inc – 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.
Priority
Highest
Lowest
Table 14-3. 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 14-12. 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 14-3.
1 = Interrupt request present
0 = No interrupt request present
Bit 0 and Bit 1 — Always read 0
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
Freescale Semiconductor
167