4.2 Sketch a LOGIC diagram of the 3 internal interrupt sources of the PIC16F877A (5)
4.2 Sketch a LOGIC diagram of the 3 internal interrupt sources of the PIC16F877A (5)
Homework Answers
Answer:
Logic diagram for three interrupt sources for Microchip PIC 16F877a are shown below.
Some explanation:
1. These three interrupt sources are Timer0 (TMR0IF), Interrupt-onPortB Change (INTF), and external interrupt on port line RB0 (RBIF).
2. Note that for any of these interrupt sources to actually interrupt the CPU, the corresponding enable bit should also be set (e.g. for timer0 interrupt to take effect TMR0IE bit needs to be set).
3. In addition to these three interrupts there are a another 12 interrupt sources. These are called called peripheral interrupts.
4. GIE, in the diagram below, stands for General Interrupt Enable. This bit must be set to 1 to enable interrupt system.
Hope this helps.
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4.2 Sketch a LOGIC diagram of the 3 internal interrupt sources
of the PIC16F877A (5)
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