Datasheet

MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
90 System Integration Module (SIM) MOTOROLA
System Integration Module (SIM)
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7.7.2 Interrupt Status Registers
The flags in the interrupt status registers identify maskable interrupt
sources. Table 7-3 summarizes the interrupt sources and the interrupt
status register flags that they set. The interrupt status registers can be
useful for debugging.
Table 7-3. Interrupt Sources
Priority 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
Vector
Address
Highest
Lowest
Reset —— —$FFFE–$FFFF
SWI instruction —— —$FFFC–$FFFD
IRQ
pin IRQF1 IMASK1 IF1 $FFFA–$FFFB
Timer channel 0 interrupt CH0F CH0IE IF3 $FFF6–$FFF7
Timer channel 1 interrupt CH1F CH1IE IF4 $FFF4–$FFF5
Timer overflow interrupt TOF TOIE IF5 $FFF2–$FFF3
Keyboard interrupt KEYF IMASKK IF14 $FFDE–$FFDF
ADC conversion
complete interrupt
COCO AIEN IF15 $FFE0–$FFE1