mc68hc908jw32 Freescale Semiconductor, Inc, mc68hc908jw32 Datasheet - Page 184

• Manufacturer Part Number: mc68hc908jw32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

External Interrupt (IRQ)
The vector fetch or software clear may occur before or after the interrupt pin returns to logic 1. As long as
the pin is low, the interrupt request remains pending. A reset will clear the latch and the MODE control bit,
thereby clearing the interrupt even if the pin stays low.
When set, the IMASK bit in the ISCR mask all external interrupt requests. A latched interrupt request is
not presented to the interrupt priority logic unless the IMASK bit is clear.
184
PTE3
IRQ
IRQPD
PTE3IE
I
PULLUP
DEVICE
NTERNAL
TO PTE3 PULLUP
ENABLE CIRCUITRY
DECODER
V
VECTOR
RESET
FETCH
DD
The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests. (See
Control.)
ACK
Figure 14-1. IRQ Module Block Diagram
MC68HC908JW32 Data Sheet, Rev. 5
MODE
"1"
"1"
NOTE
D
D
CK
CK
CLR
IRQ
CLR
FF
Q
Q
READ IOCR
PTE3IF
VOLTAGE
DETECT
HIGH
IMASK
SYNCHRO-
NIZER
6.5 Exception
Freescale Semiconductor
IRQF
TO MODE
SELECT
LOGIC
TO CPU FOR
BIL/BIH
INSTRUCTIONS
IRQ
INTERRUPT
REQUEST