PIC16F785-E/SS Microchip Technology, PIC16F785-E/SS Datasheet - Page 72

• Manufacturer Part Number: PIC16F785-E/SS
• Description: 20 PIN, 3.5 KB STD FLASH, 128 RAM, 18 I/O PB FREE,
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F785-E/SS

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT20SS1-1 - SOCKET TRANSITION 20DIP 20SSOPAC162060 - HEADER INTRFC MPLAB ICD2 20PIN
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

comparator inputs. The VRCON register (Register 10-1)
PIC16F785/HV785
10.0
There are two voltage references available in the
PIC16F785/HV785: The voltage referred to as the
comparator reference (CV
based on V
ence (VR) is a fixed voltage derived from a stable band
gap source. Each source may be individually routed
internally to the comparators or output, buffered or
unbuffered, on the RA1/AN1/C12IN0-/V
pin.
10.1
The comparator module also allows the selection of an
internally generated voltage reference for one of the
controls the voltage reference module shown in
Figure 10-1.
DS41249E-page 70
VOLTAGE REFERENCES
Comparator Reference
DD
; The voltage referred to as the VR refer-
REF
) is a variable voltage
REF
/ICSPCLK
10.1.1
The voltage reference can output 32 distinct voltage
levels, 16 in a high range and 16 in a low range.
The following equation determines the output voltages:
EQUATION 10-1:
10.1.2
The full range of V
the construction of the module. The transistors on the
top and bottom of the resistor ladder network
(Figure 10-1) keep CV
V
clearing all CVROE, C1VREN and C2VREN bits. When
disabled with VR<3:0> = 0000 and VRR = 1 the refer-
ence voltage will be V
to detect a zero-crossing and not consume CV
module current.
The voltage reference is V
CV
tested absolute accuracy of the comparator voltage
reference can be found in Table 19-8.
DD
V
V
REF
RR
RR
. The exception is when the module is disabled by
= 1 (low range):
= 0 (high range):
output changes with fluctuations in V
CV
CV
CONFIGURING THE VOLTAGE
REFERENCE
VOLTAGE REFERENCE
ACCURACY/ERROR
REF
REF
= (V
SS
= VR<3:0> x V
to V
SS
CV
DD
REF
© 2008 Microchip Technology Inc.
. This allows the comparators
DD
DD
REF
/4) + (VR<3:0> x V
from approaching V
derived and therefore, the
cannot be realized due to
OUTPUT VOLTAGE
DD
/24
DD
DD
SS
. The
/32)
REF
or