PIC16F1459-ESSQTP datasheet(74/418 Pages) MICROCHIP

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PIC16(L)F1454/5/9

DS41639A-page 74

Preliminary

 2012 Microchip Technology Inc.

5.8.5

ACTIVE CLOCK TUNING UPDATE

DISABLE

When the ACT is enabled, the OSCTUNE register is

continuously updated every ACT_clk period. Setting

the ACT Update Disable bit can be used to suspend

updates to the OSCTUNE register, without disabling

the ACT. If the 16 MHz internal oscillator drifts out of the

accuracy range, the ACT Status bits will change and an

interrupt can be generated to notify the application.

Clearing the ACTUD bit will engage the ACT updates

to OSCTUNE and an interrupt can be generated to

notify the application.

5.8.6

INTERRUPTS

The ACT will set the ACT Interrupt Flag, (ACTIF) when

either of the ACT Status bits (ACTLOCK or ACTORS)

change state, regardless if the interrupt is enabled,

(ACTIE = 1). The ACTIF and ACTIE bits are in the PIRx

and PIEx registers, respectively. When ACTIE = 1, an

interrupt will be generated whenever the ACT Status

bits change.

The ACTIF bit must be cleared in software, regardless

of the interrupt enable setting.

5.8.7

OPERATION DURING SLEEP

This ACT does not run during Sleep and will not gener-

ate interrupts during Sleep.

PIC16F1459-ESSQTP 数据表(PDF) 74 Page - Microchip Technology