Microchip Technology MA330025-1 Data Sheet

DS70616G-page 448

 2009-2012 Microchip Technology Inc.

U-0

U-0

U-0

U-0

U-0

R/W-0

R/W-0

R/W-0

—

—

—

—

—

VREFSEL

BGSEL<1:0>

bit 15

bit 8

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

CVREN

CVROE

CVRR

CVRSS

CVR<3:0>

bit 7

bit 0

Legend:
R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-11

Unimplemented: Read as ‘0’

bit 10

VREFSEL: Voltage Reference Select bit
1 = CV

REFIN

 = V

REF

+

0 = CV

REFIN

 is generated by the resistor network

bit 9-8

BGSEL<1:0>: Band Gap Reference Source Select bits
11 = IV

REF

 = V

REF

+

10 = IV

REF

 = 0.20V (nominal)

01 = IV

REF

 = 0.60V (nominal)

00 = IV

REF

 = 2.20V (nominal)

bit 7

CVREN: Comparator Voltage Reference Enable bit
1 = Comparator voltage reference circuit powered on
0 = Comparator voltage reference circuit powered down

bit 6

CVROE: Comparator Voltage Reference Output Enable bit

1 = Voltage level is output on CV

REF

 pin

0 = Voltage level is disconnected from CV

REF

 pin

bit 5

CVRR: Comparator Voltage Reference Range Selection bit
1 = CV

RSRC

/24 step-size 

0 = CV

RSRC

/32 step-size

bit 4

CVRSS: Comparator Voltage Reference Source Selection bit
1 = Comparator voltage reference source, CV

RSRC

 = (V

REF

+) – (V

REF

-)

 

0 = Comparator voltage reference source, CV

RSRC

 = AV

DD

 – AV

SS

bit 3-0

CVR<3:0> Comparator Voltage Reference Value Selection 0 

 CVR<3:0>  15 bits

When CVRR = 1:
CV

REFIN

 = (CVR<3:0>/24) • (CV

RSRC

)

When CVRR = 0:
CV

REFIN

 = 1/4 • (CV

RSRC

) + (CVR<3:0>/32) • (CV

RSRC

)

Note 1: CVROE overrides the TRIS bit setting.

2: Selecting BGSEL<1:0> = 11 and CVRSS = 1 is invalid and will produce unpredictable results.