PIC16F753 datasheet(115/230 Pages) MICROCHIP

115 / 230 page

 2013-2015 Microchip Technology Inc.

DS40001709C-page 115

PIC16F753/HV753

13.0

FIXED VOLTAGE REFERENCE

(FVR)

The Fixed Voltage Reference (FVR) is a stable voltage

reference, independent of VDD, with 1.2V output level.

The output of the FVR can be configured to supply a

reference voltage to the following:

• ADC input channel

• Comparator 1 positive input (C1VP)

• Comparator 2 positive input (C2VP)

•FVROUT pin

• Shunt regulator

On the PIC16F753, the FVR is enabled by setting the

FVREN bit of the FVRCON register. The FVR is always

enabled on the PIC16HV753 device.

13.1

Fixed Voltage Reference Output

The FVR output can be applied to the FVROUT pin by

setting the FVRBUFSS and FVRBUFEN bits of the

FVRCON register. The FVRBUFSS bit selects the op

amp, FVR or DAC output reference to the FVROUT pin

buffer. The FVRBUFEN bit enables the output buffer to

the FVROUT pin.

Enabling the FVROUT pin automatically overrides any

digital input or output functions of the pin. Reading the

FVROUT pin when it has been configured for a

reference voltage output will always return a ‘0’.

13.2

FVR Stabilization Period

When the Fixed Voltage Reference module is enabled, it

requires time for the reference circuit to stabilize. Once

the circuit stabilizes and is ready for use, the FVRRDY bit

of the FVRCON register will be set. See Section 22.0

“Electrical Specifications” for the minimum delay

requirement.

13.3

Operation During Sleep

When the device wakes up from Sleep through an

interrupt or a Watchdog Timer time-out, the contents of

the FVRCON register are not affected. To minimize

current consumption in Sleep mode, the FVR voltage

reference should be disabled.

13.4

Effects of a Reset

A device Reset clears the FVRCON register. As a result:

• The FVR module is disabled

• The FVR voltage output is disabled on the

FVROUT pin

FIGURE 13-1:

VOLTAGE REFERENCE BLOCK DIAGRAM

1.2V

VDD

FVREN

(1)

VSS

rdy

FVRRDY

To Peripherals

FVR_out

FVR_ref

Note 1: If using PIC16HV753, the FVR will be enabled.

FVRBUFSS

FVRIN

OPA_out

DAC_out

FVROE

FVRBUFEN

To Peripherals

FVR_buffer1

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