MC68HC08AB16A Datasheet, PDF (333/380 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
External Interrupt (IRQ)
Functional Description
NOTE:
The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests. (See 8.6
Exception Control.)
ACK
RESET
VECTOR
FETCH
DECODER
V_DD
INTERNAL
PULLUP
DEVICE
IRQ
V_DD
D ^CLR Q
CK
IRQ
FF
SYNCHRO-
NIZER
IMASK
TO CPU FOR
BIL/BIH
INSTRUCTIONS
IRQF
IRQ
INTERRUPT
REQUEST
MODE
HIGH
VOLTAGE
DETECT
Figure 18-1. IRQ Module Block Diagram
TO MODE
SELECT
LOGIC
Addr.
$001A
Register Name
Bit 7
IRQ Status and Control ^{Read: 0}
Register Write:
(ISCR) _{Reset: 0}
6
5
0
0
0
0
= Unimplemented
4
3
0
IRQF
0
0
Figure 18-2. IRQ I/O Register Summary
2
1
Bit 0
0
IMASK MODE
ACK
0
0
0
MC68HC08AB16A — Rev. 2.0
MOTOROLA
External Interrupt (IRQ)
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Technical Data
333