MC68HC908BD48 Datasheet, PDF (253/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

External Interrupt (IRQ)
Functional Description
NOTE: The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests.
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.
$001E
Table 18-1. IRQ I/O Register Summary
Register Name
Bit 7
6
5
Read: 0
0
0
IRQ Status and Control
Register (INTSCR)
Write:
Reset: 0
0
0
= Unimplemented
4
3
0
IRQF
0
0
2
1
Bit 0
0
IMASK MODE
ACK
0
0
0
MC68HC908BD48 — Rev. 1.0
MOTOROLA
External Interrupt (IRQ)
Technical Data
253