PIC12F752 datasheet(113/204 Pages) MICROCHIP

113 / 204 page

 2011 Microchip Technology Inc.

Preliminary

DS41576A-page 113

PIC12F752/HV752

FIGURE 14-2:

VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE

14.5

DAC Voltage Reference Output

The DAC output (dac_ref) can be applied to the

DACOUT pin as an unbuffered signal by:

• Setting the DACOE bit of the DACCON0 register

• Clearing the FVRBUFSS bit of the FVRCON

• Clearing the FVRBUFEN bit of the FVRCON

Figure 14-3 shows a block diagram pin configuration

for the dac_ref and fvr_ref signals. This unbuffered

DACOUT pin has limited current drive capability. When

a higher drive current is required, an external buffer can

be used on the DACOUT pin. Figure 14-2 shows an

example of buffering technique.

The DAC output can also be configured to use an inter-

nal buffer by:

• Setting the FVRBUFEN bit of the FVRCON regis-

ter changing the pin configuration to be the

REFOUT pin.

Enabling the DACOUT pin automatically overrides any

digital input or output functions of the pin. Reading the

DACOUT pin when it has been configured for DAC ref-

erence voltage output will always return a ‘0’.

FIGURE 14-3:

DAC/FVR OUTPUT PIN

14.6

Operation During Sleep

When the device wakes up from Sleep through an

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

the DACCON0 register are not affected. To minimize

current consumption in Sleep mode, the voltage

reference should be disabled.

14.7

Effects of a Reset

A device Reset clears the DACCON0 and DACCON1

registers. As a result:

• the DAC module is disabled.

• the DAC voltage output is disabled on the

DACOUT pin.

DACOUT

Buffered DAC Output

–

DAC

Module

Voltage

Reference

Output

Impedance

PIC® MCU

REFOUT

DACOUT

fvr_ref

dac_ref

FVRBUFSS

DACOE

FVRBUFEN

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