PIC16LF18323-ESLASHP datasheet(86/442 Pages) MICROCHIP

86 / 442 page

PIC16(L)F18313/18323

DS40001799A-page 86

Preliminary

 2015 Microchip Technology Inc.

7.3

Interrupts During Sleep

Some interrupts can be used to wake from Sleep. To

wake from Sleep, the peripheral must be able to

operate without the system clock. The interrupt source

must have the appropriate Interrupt Enable bit(s) set

prior to entering Sleep.

On waking from Sleep, if the GIE bit is also set, the

processor will branch to the interrupt vector. Otherwise,

the processor will continue executing instructions after

the SLEEP instruction. The instruction directly after the

SLEEP

instruction will always be executed before

branching

the

ISR.

Refer

Section 8.0

“Power-Saving Operation Modes”

for more details.

7.4

INT Pin

The INT pin can be used to generate an asynchronous

edge-triggered interrupt. This interrupt is enabled by

setting the INTE bit of the PIE0 register. The INTEDG bit

of the INTCON register determines on which edge the

interrupt will occur. When the INTEDG bit is set, the

rising edge will cause the interrupt. When the INTEDG

bit is clear, the falling edge will cause the interrupt. The

INTF bit of the PIR0 register will be set when a valid

edge appears on the INT pin. If the GIE and INTE bits

are also set, the processor will redirect program

execution to the interrupt vector.

7.5

Automatic Context Saving

Upon entering an interrupt, the return PC address is

saved on the stack. Additionally, the following registers

are automatically saved in the shadow registers:

• W register

• STATUS register (except for TO and PD)

• BSR register

• FSR registers

• PCLATH register

Upon exiting the Interrupt Service Routine, these

registers are automatically restored. Any modifications

to these registers during the ISR will be lost. If

modifications to any of these registers are desired, the

corresponding shadow register should be modified and

the value will be restored when exiting the ISR. The

shadow registers are available in Bank 31 and are

readable and writable. Depending on the user’s

application, other registers may also need to be saved.

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