MC68HC908GR16A Datasheet, PDF (140/270 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Resets and Interrupts
Interrupts must be acknowledged by writing a 1 to the TACK bit.
13.3.3 Interrupt Status Registers
The flags in the interrupt status registers identify maskable interrupt sources.
Table 13-2 summarizes the interrupt sources and the interrupt status register flags that they set. The
interrupt status registers can be useful for debugging.
Table 13-2. Interrupt Source Flags
Interrupt Source
Reset
SWI instruction
IRQ pin
CGM change of lock
TIM1 channel 0
TIM1 channel 1
TIM1 overflow
TIM2 channel 0
TIM2 channel 1
TIM2 overflow
SPI receive
SPI transmit
SCI error
SCI receive
SCI transmit
Keyboard
ADC conversion complete
Timebase
Interrupt Status Register Flag
—
—
IF1
IF2
IF3
IF4
IF5
IF6
IF7
IF8
IF9
IF10
IF11
IF12
IF13
IF14
IF15
IF16
13.3.3.1 Interrupt Status Register 1
Address: $FE04
Bit 7
6
5
4
3
2
1
Bit 0
Read: IF6
IF5
IF4
IF3
IF2
IF1
0
0
Write: R
R
R
R
R
R
R
R
Reset: 0
0
0
0
0
0
0
0
R
= Reserved
Figure 13-6. Interrupt Status Register 1 (INT1)
IF6–IF1 — Interrupt Flags 6–1
These flags indicate the presence of interrupt requests from the sources shown in Table 13-2.
1 = Interrupt request present
0 = No interrupt request present
Bit 1 and Bit 0 — Always read 0
MC68HC908GR16A Data Sheet, Rev. 1.0
140
Freescale Semiconductor