PIC16C641-04SLASHTQ datasheet(53/136 Pages) MICROCHIP

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Preliminary

DS30559A-page 53

PIC16C64X & PIC16C66X

8.0

VOLTAGE REFERENCE

MODULE

The Voltage Reference is a 16-tap resistor ladder

network that provides a selectable voltage reference.

The resistor ladder is segmented to provide two ranges

of VREF values and has a power-down function to

conserve power when the reference module is not

being used.

The VRCON register, shown in Figure 8-1, controls the

operation of the Voltage Reference Module. The block

diagram is given in Figure 8-2.

FIGURE 8-1:

VRCON REGISTER (ADDRESS 9Fh)

FIGURE 8-2:

VOLTAGE REFERENCE BLOCK DIAGRAM

R/W-0

U-0

R/W-0

VREN

VROE

VRR

—

VR3

VR2

VR1

VR0

R =Readable bit

W =Writable bit

U =Unimplemented bit, read

as ‘0’

- n =Value at POR reset

bit7

bit0

bit 7:

VREN: VREF Enable

1 = VREF circuit powered up

0 = VREF circuit powered down, no IDD drain

bit 6:

VROE: VREF Output Enable

1 = VREF is output on RA2 pin

0 = VREF is disconnected from RA2 pin

bit 5:

VRR: VREF Range selection

1 = Low Range

0 = High Range

bit 4:

Unimplemented: Read as '0'

bit 3-0: VR3:VR0: VREF value selection 0

≤ VR3:VR0 ≤ 15

When: VRR = 1

Then: VREF = (VR3:VR0/ 24) • VDD

When: VRR = 0

Then: VREF = 1/4 • VDD + (VR3:VR0/ 32) • VDD

Note:

R is deﬁned in Table 12-3.

VRR

VR3

VR0

(From VRCON<3:0>)

16-1 Analog Mux

VREN

VREF

16 Stages

VR2

VR1

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