mc68hc908lv8 Freescale Semiconductor, Inc, mc68hc908lv8 Datasheet - Page 148

• Manufacturer Part Number: mc68hc908lv8
• Description: M68hc08 Microcontrollers 8-bit Microcontroller With Integrated Lcd Driver
• Manufacturer: Freescale Semiconductor, Inc

External Interrupt (IRQ)
The vector fetch or software clear may occur before or after the interrupt pin returns to logic one. 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 INTSCR mask all external interrupt requests. A latched interrupt request
is not presented to the interrupt priority logic unless the IMASK bit is clear.
148
$001E
Addr.
IRQ
IRQ Status and Control
Register Name
The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests. (See
Control.)
DECODER
VECTOR
FETCH
RESET
ACK
V
DD
INTERNAL
PULLUP
DEVICE
(INTSCR)
Register
Reset:
Read:
Write:
Figure 11-1. IRQ Module Block Diagram
Figure 11-2. IRQ I/O Register Summary
V
MODE
DD
Bit 7
0
0
D
MC68HC908LV8 Data Sheet, Rev. 2
CK
CLR
Q
= Unimplemented
6
0
0
NOTE
5
0
0
IMASK
SYNCHRONIZER
4
0
0
VOLTAGE
DETECT
HIGH
IRQF
3
0
4.5 Exception
ACK
2
0
0
IRQF
Freescale Semiconductor
IMASK
1
0
TO CPU FOR
BIL/BIH
INSTRUCTIONS
IRQ
INTERRUPT
REQUEST
TO MODE
SELECT
LOGIC
MODE
Bit 0
0