May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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204
EXTERNAL INTERRUPTS
IP.7 IP.6 IP.5
(MSB)
reg. IP
Direct address B8H
Individual bit address
0 = Lowest priority of external interrupt 1
1 = Highest priority of external interrupt 1
0 = Lowest priority of external interrupt 0
1 = Highest priority of exterrnal interrupt 0
(Note: Remaining bits’ functions explained at appropriate places)
-- -- PT2 PS PT1 PX1 PX0PT0
(LSB)
B8B9BABBBCBDBEBF
IP.4 IP.3 IP.2 IP.1 IP.0
In Table 14.1, default priorities of all interrupts are presented in the last column. Here the highest priority
is designated as 1 and is assigned to the external interrupt INT0. INT1 is assigned a priority of 3. is indicates
that if both INT0 and ...
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