PIC16F648A-E/SO Microchip Technology, PIC16F648A-E/SO Datasheet - Page 69
![IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SOP,18PIN,PLASTIC](/photos/6/76/67656/150-18-soic_sml.jpg)
PIC16F648A-E/SO
Manufacturer Part Number
PIC16F648A-E/SO
Description
IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SOP,18PIN,PLASTIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F627A-IP.pdf
(180 pages)
3.PIC16F627A-IP.pdf
(8 pages)
4.PIC16F627A-IP.pdf
(22 pages)
Specifications of PIC16F648A-E/SO
Rohs Compliant
YES
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
7KB (4K x 14)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
18-SOIC (7.5mm Width)
Processor Series
PIC16F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
SCI, USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
16
Number Of Timers
3
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014, DM164120-4
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
I3DBF648 - BOARD DAUGHTER ICEPIC3
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F648A-E/SO
Manufacturer:
INTEL
Quantity:
5
11.0
The Voltage Reference module consists of a 16-tap
resistor ladder network that provides a selectable volt-
age reference. The resistor ladder is segmented to pro-
vide two ranges of V
function to conserve power when the reference is not
being used. The VRCON register controls the opera-
tion of the reference as shown in Figure 11-1. The
block diagram is given in Figure 11-1.
11.1
The Voltage Reference module can output 16 distinct
voltage levels for each range.
REGISTER 11-1:
© 2009 Microchip Technology Inc.
VOLTAGE REFERENCE
MODULE
Voltage Reference Configuration
bit 7
bit 6
bit 5
bit 4
bit 3-0
REF
VRCON – VOLTAGE REFERENCE CONTROL REGISTER (ADDRESS: 9Fh)
bit 7
VREN: V
1 = V
0 = V
VROE: V
1 = V
0 = V
VRR: V
1 = Low range
0 = High range
Unimplemented: Read as ‘0’
VR<3:0>: V
When VRR = 1: V
When VRR = 0: V
Legend:
R = Readable bit
-n = Value at POR
values and has a power-down
R/W-0
VREN
REF
REF
REF
REF
REF
REF
REF
circuit powered on
circuit powered down, no I
is output on RA2 pin
is disconnected from RA2 pin
Range Selection bit
REF
Enable bit
Output Enable bit
R/W-0
VROE
Value Selection bits 0 ≤ VR <3:0> ≤ 15
REF
REF
= (VR<3:0>/ 24) * V
= 1/4 * V
R/W-0
VRR
W = Writable bit
‘1’ = Bit is set
DD
PIC16F627A/628A/648A
+ (VR<3:0>/ 32) * V
DD
U-0
—
drain
The equations used to calculate the output of the
Voltage Reference module are as follows:
The setting time of the Voltage Reference module must
be considered when changing the V
(Table 17-3). Example 11-1 demonstrates how voltage
reference is configured for an output voltage of 1.25V
with V
DD
if VRR = 1:
if VRR = 0:
DD
V
= 5.0V.
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
REF
VR3
DD
=
V
REF
⎛
⎝
V
DD
=
×
R/W-0
V
---------------------- -
VR2
R
1
-- -
4
⎞
⎠
<3:0>
24
+
V
---------------------- -
R
x = Bit is unknown
<3:0>
×
32
R/W-0
V
VR1
REF
DD
DS40044G-page 69
×
output
V
DD
R/W-0
VR0
bit 0