Datasheet

External Interrupt (IRQ)
MC68HC908LJ12 — Rev. 2.1 Technical Data
Freescale Semiconductor External Interrupt (IRQ) 359
Figure 18-1. IRQ Module Block Diagram
IMASK
DQ
CK
CLR
IRQ
HIGH
INTERRUPT
TO MODE
SELECT
LOGIC
REQUEST
V
DD
MODE
VOLTAGE
DETECT
IRQF
TO CPU FOR
BIL/BIH
INSTRUCTIONS
VECTOR
FETCH
DECODER
INTERNAL ADDRESS BUS
RESET
ACK
IRQ
SYNCHRONIZER
V
DD
INTERNAL
PULLUP
DEVICE
Addr. Register Name Bit 7 6 5 4 3 2 1 Bit 0
$001E
IRQ Status and Control
Register
(INTSCR)
Read: 0000IRQF0
IMASK MODE
Write:
ACK
Reset:00000000
= Unimplemented
Table 18-1. IRQ I/O Port Register Summary