DSPIC33EP64GS708 datasheet(83/484 Pages) MICROCHIP

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DS70005258C-page 83

dsPIC33EPXXXGS70X/80X FAMILY

7.3

Interrupt Resources

Many useful resources are provided on the main prod-

uct page of the Microchip website for the devices listed

in this data sheet. This product page contains the latest

updates and additional information.

7.3.1

KEY RESOURCES

• “Interrupts” (DS70000600) in the

“dsPIC33/PIC24 Family Reference Manual”

• Code Samples

• Application Notes

• Software Libraries

•Webinars

• All Related “dsPIC33/PIC24 Family Reference

Manual” Sections

• Development Tools

7.4

Interrupt Control and Status

Registers

dsPIC33EPXXXGS70X/80X family devices implement

the following registers for the interrupt controller:

• INTCON1

• INTCON2

• INTCON3

• INTCON4

•INTTREG

7.4.1

INTCON1 THROUGH INTCON4

Global interrupt control functions are controlled from

INTCON1, INTCON2, INTCON3 and INTCON4.

INTCON1 contains the Interrupt Nesting Disable bit

(NSTDIS), as well as the control and status flags for the

processor trap sources.

The INTCON2 register controls external interrupt

request signal behavior, contains the Global Interrupt

Enable bit (GIE) and the Alternate Interrupt Vector Table

Enable bit (AIVTEN).

INTCON3 contains the status flags for the Auxiliary

PLL and DO stack overflow status trap sources.

The INTCON4 register contains the Software

Generated Hard Trap Status bit (SGHT).

7.4.2

IFSx

The IFSx registers maintain all of the interrupt request

flags. Each source of interrupt has a status bit, which is

set by the respective peripherals or external signal and

is cleared via software.

7.4.3

IECx

The IECx registers maintain all of the interrupt enable

bits. These control bits are used to individually enable

interrupts from the peripherals or external signals.

7.4.4

IPCx

The IPCx registers are used to set the Interrupt Priority

Level (IPL) for each source of interrupt. Each user

interrupt source can be assigned to one of seven

priority levels.

7.4.5

INTTREG

The INTTREG register contains the associated

interrupt vector number and the new CPU Interrupt

Priority Level, which are latched into the Vector

Number of Pending Interrupt bits (VECNUM<7:0>) and

New CPU Interrupt Priority Level bits (ILR<3:0>) fields

in the INTTREG register. The new Interrupt Priority

Level is the priority of the pending interrupt.

The interrupt sources are assigned to the IFSx, IECx

and IPCx registers in the same sequence as they are

listed in Table 7-1. For example, the INT0 (External

Interrupt 0) is shown as having Vector Number 8 and a

natural order priority of 0. Thus, the INT0IF bit is found

in IFS0<0>, the INT0IE bit in IEC0<0> and the

INT0IP<2:0> bits in the first position of IPC0

(IPC0<2:0>).

7.4.6

STATUS/CONTROL REGISTERS

Although these registers are not specifically part of the

interrupt control hardware, two of the CPU Control

registers contain bits that control interrupt functionality.

For more information on these registers, refer to

“dsPIC33E Enhanced CPU” (DS70005158) in the

“dsPIC33/PIC24 Family Reference Manual”.

• The CPU STATUS Register, SR, contains the

IPL<2:0> bits (SR<7:5>). These bits indicate the

current CPU Interrupt Priority Level. The user

software can change the current CPU Interrupt

Priority Level by writing to the IPLx bits.

• The CORCON register contains the IPL3 bit

which, together with IPL<2:0>, also indicates the

current CPU priority level. IPL3 is a read-only bit

so that trap events cannot be masked by the user

software.

All Interrupt registers are described in Register 7-3

through Register 7-7 in the following pages.

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