MC908QT1 FREESCALE [Freescale Semiconductor, Inc], MC908QT1 Datasheet - Page 112

• Manufacturer Part Number: MC908QT1
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

System Integration Module (SIM)
13.6.1.2 SWI Instruction
The SWI instruction is a non-maskable instruction that causes an interrupt regardless of the state of the
interrupt mask (I bit) in the condition code register.
13.6.2 Interrupt Status Registers
The flags in the interrupt status registers identify maskable interrupt sources.
interrupt sources and the interrupt status register flags that they set. The interrupt status registers can be
useful for debugging.
112
Priority
Highest
Lowest
1. The I bit in the condition code register is a global mask for all interrupt sources except the SWI
A software interrupt pushes PC onto the stack. A software interrupt does
not push PC – 1, as a hardware interrupt does.
instruction.
Reset
SWI instruction
IRQ pin
Timer channel 0 interrupt
Timer channel 1 interrupt
Timer overflow interrupt
Keyboard interrupt
ADC conversion complete interrupt
INT1
INT2
Figure 13-10
MC68HC908QY/QT Family Data Sheet, Rev. 5
Source
CLI
LDA
PSHH
PULH
RTI
PSHH
PULH
RTI
Table 13-3. Interrupt Sources
#$FF
.
Interrupt Recognition Example
NOTE
COCO
CH0F
CH1F
KEYF
IRQF
Flag
TOF
—
—
INT1 INTERRUPT SERVICE ROUTINE
INT2 INTERRUPT SERVICE ROUTINE
IMASKK
Mask
IMASK
CH0IE
CH1IE
AIEN
TOIE
—
—
(1)
Register
Flag
IF15
IF14
INT
IF1
IF3
IF4
IF5
—
—
BACKGROUND ROUTINE
Table 13-3
$FFDE–$FFDF
$FFFC–$FFFD
$FFFE–$FFFF
$FFFA–$FFFB
$FFE0–$FFE1
$FFF6–$FFF7
$FFF4–$FFF5
$FFF2–$FFF3
Address
Vector
Freescale Semiconductor
summarizes the