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FX2LP/FX1 External Interrupts
------------------------------
The purpose of this example is to demonstrate that the
functioning of External interrupts (INT0, INT1, INT4, INT5 and INT6) and
how toset them up.
This directory contains the frameworks fw.c, the test program extr_intr.c
and the external interrupt service routines isr.c. This was compiled
using micro vision2.
NOTE: The USBJmpTb.a51 is added to the project directory. Note that this
is the not the default USBJmpTb.obj file. This file is a modified version
of the default one. Please refer to the comments included in the USBJmpTb.a51
file.
To run the test
(1) Download extr_intr.hex using the control panel
(2) Use a function generator to trigger the interrupts.
Set the FG to generate a square wave of frequency of 1 KHZ
NOTE: Make sure that the square wave is of 1 KHz on the scope
(3) Connect the probes to the corresponding external interrupt pin
(4) The corresponding pins on PORTC will toggle on the appropriate edge of
the signal connected to the external interrupt pin
External Interrupt External PORTA pin toggled
pin Interrupt in the ISR
PA0 ----> INT0 ----> PC0
PA1 ----> INT1 ----> PC1
INT4 ----> INT4 ----> PC4
INT5 ----> INT5 ----> PC5
PE5 ----> INT6 ----> PC6
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