DM163035+TEFLCST3 Microchip Technology, DM163035+TEFLCST3 Datasheet - Page 76

• Manufacturer Part Number: DM163035+TEFLCST3
• Description: KIT, PICDEMLAB+FLOWCODE-HOME BUNDLE/
• Manufacturer: Microchip Technology

Specifications of DM163035+TEFLCST3

• Kit Contents: Component Kit, PICDEM Lab Development Board, PICkit 2 Programmer/ Debugger, CD Containing User Guide
• Svhc: No SVHC (15-Dec-2010)
• Development Tool Type: Hardware / Software - Dev
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC10, PIC12, PIC16
• Silicon Core Number: PIC10F, PIC12F, PIC16F
• Silicon Family Name: PIC10F2xx, PIC12F6xx, PIC16F6xx
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PICDEM
DS41381A-page 72
TM
3.2.5
3.2.5.1
To configure the peripherals used in this lab, the following registers are used:
1. Voltage Reference Control Register: VRCON (Register 8-5 in Section 8 of the
3.2.5.2
This lab expands on Lab 1 by utilizing the internal Comparator Voltage Reference
(CV
voltage reference that can be used by the Comparator 1’s non-inverting reference
input, so that external components are not needed such as the resistor voltage divider
used in the previous lab. The CV
The CV
controlled by the CV
Control Register) along with the CV
Selection bits hold a value based upon some simple calculations to set the internal
reference voltage. The CV
EQUATION 3-1:
This lab will implement the low-range calculation by setting the VRR bit in VRCON
equal to 1. Equation 3-2 demonstrates how to calculate the VR<3:0> values, using the
low-range method, to obtain a 2.5V internal reference. If higher resolutions are
required, the High Range method should be used (see Section 8.10.2 in the
PIC16F690 data sheet).
Lab Flowcode Companion Guide
- Enables either the Comparator Voltage Reference or the 0.6V constant
- Selects either a High or Low resolution 16-level voltage range
- Enables a 0.6V reference
- Uses three bits to configure the reference voltage level
- Independent comparator operation
- Two 16-level voltage ranges
- Ratiometric with V
- Fixed 0.6V reference option
- Output clamped to V
VRR = 1 (Low-Range):
VRR = 0 (Low-Range):
REF
PIC16F690 data sheet)
reference as the non-inverting reference input to Comparator C1 or
Comparator C2.
) feature on the PIC16F690. The CV
REF
Lab 2: Using the Comparator Voltage Reference
NEW REGISTERS USED IN THIS LAB
OVERVIEW
has 2 ranges with 16 voltage levels in each range. Range selection is
REF
CVREF Output Voltage
CV
CV
DD
Range Selection (VRR) bit in the VRCON (Voltage Reference
SS
REF
REF
REF
= (VR<3:0>/24) x V
= (V
voltage is determined using Equation 3-1:
REF
DD
REF
/4) + (VR<3:0> x V
features:
Value Selection bits (VR<3:0>). The Value
REF
DD
provides an internally generated
DD
/32)
© 2009 Microchip Technology Inc.