s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 134

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

External Interrupt Module (IRQ1)
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 MODE1 control
bit, thereby clearing the interrupt even if the pin stays low.
When set, the IMASK bit in the ISCR masks all external interrupt requests. A latched interrupt request is
not presented to the interrupt priority logic unless the corresponding IMASK bit is clear.
134
$001A
Addr.
IRQ1
IRQ Status/Control Register
Register Name
The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests.
(See
DECODER
VECTOR
FETCH
ACK
Figure
(ISCR)
15-3).
Figure 15-2. IRQ I/O Register Summary
Read:
V
Write:
MODE
DD
Figure 15-1. IRQ Block Diagram
MC68HC908AZ32A Data Sheet, Rev. 2
D
CK
LATCH
CLR
IRQ
Bit 7
R
R
0
Q
= Reserved
R
6
0
NOTE
R
5
0
IMASK
SYNCHRO-
VOLTAGE
DETECT
NIZER
HIGH
R
4
0
IRQF
R
3
ACK
IRQF
2
0
Freescale Semiconductor
IMASK
TO CPU FOR
BIL/BIH
INSTRUCTIONS
IRQ
INTERRUPT
REQUEST
TO MODE
SELECT
LOGIC
1
MODE
Bit 0