
Interrupts
MC68HC908GT16 MC68HC908GT8 MC68HC08GT16 Data Sheet, Rev. 5.0
Freescale Semiconductor
143
modifies the H register or uses the indexed addressing mode, save the H
register and then restore it prior to exiting the routine.
13.3.2 Sources
The sources in
Table 13-1 can generate CPU interrupt requests.
13.3.2.1 Software Interrupt (SWI) Instruction
The software interrupt instruction (SWI) causes a non-maskable interrupt.
NOTE
A software interrupt pushes PC onto the stack. An SWI does not push PC
– 1, as a hardware interrupt does.
Table 13-1. Interrupt Sources
Source
Flag
Mask(1)
1. The I bit in the condition code register is a global mask for all interrupt sources except the SWI instruction.
INT Register
Flag
Priority(2)
2. 0 = highest priority
Vector Address
Reset
None
0
$FFFE
–$FFFF
SWI instruction
None
0
$FFFC
–$FFFD
IRQ pin
IRQF
IMASK1
IF1
1
$FFFA
–$FFFB
ICG clock monitor
CMF
CMIE
IF2
2
$FFF8–$FFF9
TIM1 channel 0
CH0F
CH0IE
IF3
3
$FFF6–$FFF7
TIM1 channel 1
CH1F
CH1IE
IF4
4
$FFF4–$FFF5
TIM1 overflow
TOF
TOIE
IF5
5
$FFF2–$FFF3
TIM2 channel 0
CH0F
CH0IE
IF6
6
$FFF0–$FFF1
TIM2 channel 1
CH1F
CH1IE
IF7
7
$FFEE–$FFEF
TIM2 overflow
TOF
TOIE
IF8
8
$FFEC–$FFED
SPI receiver full
SPRF
SPRIE
IF9
9
$FFEA–$FFEB
SPI overflow
OVRF
ERRIE
SPI mode fault
MODF
ERRIE
SPI transmitter empty
SPTE
SPTIE
IF10
10
$FFE8–$FFE9
SCI receiver overrun
OR
ORIE
IF11
11
$FFE6–$FFE7
SCI noise fag
NF
NEIE
SCI framing error
FE
FEIE
SCI parity error
PE
PEIE
SCI receiver full
SCRF
SCRIE
IF12
12
$FFE4–$FFE5
SCI input idle
IDLE
ILIE
SCI transmitter empty
SCTE
SCTIE
IF13
13
$FFE2–$FFE3
SCI transmission complete
TC
TCIE
Keyboard pin
KEYF
IMASKK
IF14
14
$FFE0–$FFE1
ADC conversion complete
COCO
AIEN
IF15
15
$FFDE–$FFDF
Timebase
TBIF
TBIE
IF16
16
$FFDC–$FFDD