PIC24FJ128GA006-IPT datasheet(66/258 Pages) MICROCHIP

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PIC24FJ128GA010 FAMILY

DS39747F-page 66

 2005-2012 Microchip Technology Inc.

7.3

Interrupt Control and Status

Registers

The PIC24FJ128GA010 family devices implement a

total of 29 registers for the interrupt controller:

• INTCON1

• INTCON2

• IFS0 through IFS4

• IEC0 through IEC4

• IPC0 through IPC14, and IPC16

•INTTREG

Global interrupt control functions are controlled from

INTCON1 and INTCON2. INTCON1 contains the Inter-

rupt Nesting Disable (NSTDIS) bit, as well as the

control and status flags for the processor trap sources.

The INTCON2 register controls the external interrupt

request signal behavior and the use of the Alternate

Interrupt Vector Table.

The IFS 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.

The IEC registers maintain all of the interrupt enable

bits. These control bits are used to individually enable

interrupts from the peripherals or external signals.

The IPC registers are used to set the Interrupt Priority

Level for each source of interrupt. Each user interrupt

source can be assigned to one of eight priority levels.

The interrupt sources are assigned to the IFSx, IECx

and IPCx registers in the same sequence that they are

listed in Table 7-2. For example, the INT0 (External

Interrupt 0) is shown as having a vector number and a

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

found in IFS0<0>, the enable bit in IEC0<0> and the

priority bits in the first position of IPC0 (IPC0<2:0>).

Although they are not specifically part of the interrupt

control hardware, two of the CPU control registers con-

tain bits that control interrupt functionality. The CPU

STATUS register (SR) contains the IPL<2:0> bits

(SR<7:5>). These indicate the current CPU Interrupt

Priority Level. The user may change the current CPU

priority level by writing to the IPL 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.

The interrupt controller has the Interrupt Controller Test

interrupt controller. When an interrupt request occurs,

its associated vector number and the new interrupt pri-

ority level are latched into INTTREG. This information

can be used to determine a specific interrupt source if

a generic ISR is used for multiple vectors, such as

when ISR remapping is used in bootloader applica-

tions. It also could be used to check if another interrupt

is pending while in an ISR.

All Interrupt registers are described in Register 7-1

through Register 7-30, in the following pages.

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