We can Read MCU PIC18F6622 Protected Code, please view the MCU PIC18F6622 features for your reference:
In general, interrupt sources have three bits to control their operation. They are:
• Flag bit to indicate that an interrupt event occurred
• Enable bit that allows program execution to branch to the interrupt vector address when the flag bit is set
• Priority bit to select high priority or low priority
The interrupt priority feature is enabled by setting the IPEN bit (RCON<7>). When interrupt priority is enabled, there are two bits which enable interrupts globally which is useful for Read Out PIC16F785 Heximal File. Setting the GIEH bit (INTCON<7>) enables all interrupts that have the priority bit set (high priority) when Read MCU PIC18F6622 Protected Code.
Setting the GIEL bit (INTCON<6>) enables all interrupts that have the priority bit cleared (low priority). When the interrupt flag, enable bit and appropriate global interrupt enable bit are set, the interrupt will vector immediately to address 0008h or 0018h, depending on the priority bit setting only after Read Microcontroller PIC16F777 Heximal.
Individual interrupts can be disabled through their corresponding enable bits. When the IPEN bit is cleared (default state), the interrupt priority feature is disabled and interrupts are compatible with PICmicro® mid-range devices. In
Compatibility mode, the interrupt priority bits for each source have no effect. INTCON<6> is the PEIE bit, which enables/disables all peripheral interrupt sources if Read MCU PIC18F6622 Protected Code.
INTCON<7> is the GIE bit, which enables/disables all interrupt sources. All interrupts branch to address 0008h in Compatibility mode. When an interrupt is responded to, the global interrupt enable bit is cleared to disable further interrupts to facilitate the process of Copy Chip PIC16F767 Program. If the IPEN bit is cleared, this is the GIE bit. If interrupt priority levels are used, this will be either the GIEH or GIEL bit.
High priority interrupt sources can interrupt a low priority interrupt. Low priority interrupts are not processed while high priority interrupts are in progress. The return address is pushed onto the stack and the PC is loaded with the interrupt vector address (0008h or 0018h) after Read MCU PIC18F6622 Protected Code.
Once in the Interrupt Service Routine, the source(s) of the interrupt can be determined by polling the interrupt flag bits to ease the progress of Microcontroller Unlocking. The interrupt flag bits must be cleared in software before re-enabling interrupts to avoid recursive interrupts.
