PIC16F526-I/ST Microchip Technology, PIC16F526-I/ST Datasheet - Page 69

• Manufacturer Part Number: PIC16F526-I/ST
• Description: 1.5KB Flash Program, 64B Flash Data, 8MHz Internal Oscillator, 8b ADC, 2x Compar
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F526-I/ST

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: POR, WDT
• Number Of I /o: 11
• Program Memory Size: 1.5KB (1K x 12)
• Program Memory Type: FLASH
• Ram Size: 67 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 3x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 14-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ICE2000 - EMULATOR MPLAB-ICE 2000 POD
• Eeprom Size: -
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.0
The Comparator Voltage Reference module also
allows the selection of an internally generated voltage
reference for one of the C2 comparator inputs. The
VRCON register (Register 11-1) controls the Voltage
Reference module shown in Figure 11-1.
11.1
The voltage reference can output 32 voltage levels; 16
in a high range and 16 in a low range.
Equation 11-1 determines the output voltages:
EQUATION 11-1:
REGISTER 11-1:
 2010 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6
bit 5
bit 4
bit 3-0
VRR = 0 (high range):
VRR = 1 (low range): CV
Note 1: When this bit is set, the TRIS for the CV
R/W-0
VREN
CV
COMPARATOR VOLTAGE
REFERENCE MODULE
Configuring The Voltage
Reference
REF
CV
= (V
REF
VREN: CV
1 = CV
0 = CV
VROE: CV
1 = CV
0 = CV
VRR: CV
1 = Low range
0 = High range
Unimplemented: Read as ‘0’
VR<3:0> CV
When V
When V
DD
pin.
R/W-0
VROE
/4) + (VR<3:0> x V
VRCON: VOLTAGE REFERENCE CONTROL REGISTER
REF
REF
REF
REF
RR
RR
REF
REF
REF
REF
= 1: CV
= 0: CV
is powered on
is powered down, no current is drawn
output is enabled
output is disabled
= (VR<3:0>/24) x V
REF
Range Selection bit
W = Writable bit
‘1’ = Bit is set
Enable bit
Output Enable bit
Value Selection bit
R/W-0
VRR
REF
REF
= (VR<3:0>/24)*V
= V
DD
/32)
DD
/4+(VR<3:0>/32)*V
DD
(1)
U-0
—
REF
DD
pin is overridden and the analog voltage is placed on the
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
11.2
The full range of V
construction of the module. The transistors on the top
and bottom of the resistor ladder network (Figure 11-1)
keep CV
exception is when the module is disabled by clearing
the VREN bit of the VRCON register. When disabled,
the reference voltage is V
and the VRR bit of the VRCON register is set. This
allows the comparator to detect a zero-crossing and
not consume the CV
The voltage reference is V
the CV
The tested absolute accuracy of the comparator
voltage reference can be found in Section 14.0 “Elec-
trical Characteristics”.
VR3
DD
REF
Voltage Reference Accuracy/Error
REF
output changes with fluctuations in V
R/W-0
from approaching V
VR2
SS
REF
to V
module current.
DD
x = Bit is unknown
PIC16F526
SS
DD
cannot be realized due to
when VR<3:0> is ‘0000’
R/W-0
VR1
derived and, therefore,
SS
DS41326E-page 69
or V
R/W-0
VR0
DD
. The
bit 0
DD
.