DV164136 Microchip Technology, DV164136 Datasheet - Page 312

• Manufacturer Part Number: DV164136
• Description: DEVELOPMENT KIT FOR PIC18
• Manufacturer: Microchip Technology
• Series: PIC®r
• Type: MCUr

Specifications of DV164136

• Contents: Board, Cables, CDs, PICkit™ 3 Programmer, Power Supply
• Processor To Be Evaluated: PIC18F8722, PIC18F87J11
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3.3 V, 5 V
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18F8xxx
• Kit Contents: PIC18 Exp Brd PICkit 3 Cable CD PSU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC18F8722, PIC18F87J11
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F87J11 FAMILY
23.1
The comparator voltage reference module is controlled
through the CVRCON register (Register 23-1). The
comparator voltage reference provides two ranges of
output voltage, each with 16 distinct levels. The range
to be used is selected by the CVRR bit (CVRCON<5>).
The primary difference between the ranges is the size
of the steps selected by the CV
(CVR3:CVR0), with one range offering finer resolution.
The equations used to calculate the output of the
comparator voltage reference are as follows:
REGISTER 23-1:
DS39778D-page 312
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6
bit 5
bit 4
bit 3-0
Note 1:
CVREN
R/W-0
If CVRR = 1:
CV
If CVRR = 0:
CV
(CV
REF
REF
RSRC
Configuring the Comparator
Voltage Reference
CVROE overrides the TRISF<5> bit setting.
= ((CVR3:CVR0)/24) x (CV
= (CV
)
CVREN: Comparator Voltage Reference Enable bit
1 = CV
0 = CV
CVROE: Comparator V
1 = CV
0 = CV
CVRR: Comparator V
1 = 0 to 0.667 CV
0 = 0.25 CV
CVRSS: Comparator V
1 = Comparator reference source, CV
0 = Comparator reference source, CV
CVR3:CVR0: Comparator V
When CVRR = 1:
CV
When CVRR = 0:
CV
CVROE
RSRC
REF
REF
R/W-0
CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
/4) + ((CVR3:CVR0)/32) x
= ((CVR3:CVR0)/24) • (CV
= (CV
REF
REF
REF
REF
(1)
circuit powered on
circuit powered down
voltage level is also output on the RF5/AN10/C1INB/CV
voltage is disconnected from the RF5/AN10/C1INB/CV
RSRC
RSRC
W = Writable bit
‘1’ = Bit is set
R/W-0
CVRR
/4) + ((CVR3:CVR0)/32) • (CV
RSRC
to 0.75 CV
REF
REF
REF
RSRC
REF
, with CV
Selection bits
Range Selection bit
Source Selection bit
Output Enable bit
REF
)
RSRC
CVRSS
RSRC
Value Selection bits (0 ≤ (CVR3:CVR0) ≤ 15)
R/W-0
, with CV
RSRC
/24 step size (low range)
RSRC
RSRC
)
RSRC
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
= (V
= AV
(1)
R/W-0
CVR3
The comparator reference supply voltage can come
from either V
V
voltage source is selected by the CVRSS bit
(CVRCON<4>).
The settling time of the comparator voltage reference
must be considered when changing the CV
output (see Table 27-3 in Section 27.0 “Electrical
Characteristics”).
The CVRCON register is a shared address SFR and
uses the same address as the PR4 register. The
CVRCON register is accessed by setting the ADSHR
bit (WDTCON<4>).
/32 step size (high range)
REF
RSRC
DD
REF
+) – (V
– AV
- that are multiplexed with RA2 and RA3. The
)
SS
REF
DD
-)
R/W-0
CVR2
and V
REF
REF
pin
SS
pin
© 2009 Microchip Technology Inc.
x = Bit is unknown
, or the external V
R/W-0
CVR1
R/W-0
CVR0
REF
+ and
bit 0
REF