Information

PIC16(L)F1508/1509

DS80536D-page 4  2012-2013 Microchip Technology Inc.

3. Module: Fixed Voltage Reference (FVR)

3.1 Gain Amplifier Output

When using the FVR module, if the gain amplifier

outputs are set via the CDAFVR or ADFVR bits in

FVRCON while the module is disabled (FVREN =

0), the internal oscillator frequency may shift,

device current consumption can increase, and a

Brown-out Reset may occur.

Work around

Set the FVREN bit of FVRCON to enable the

module prior to adjusting the amplifier output

selections with the CDAFVR and ADFVR bits. If

switching from the 4x output setting to the 1x

output setting, select the 2x output setting as an

intermediary step. Always set the amplifier output

selections to off (’00’) before disabling the FVR

module.

Affected Silicon Revisions

A0 A2