PIC16F721-I/SO Microchip Technology, PIC16F721-I/SO Datasheet - Page 67

• Manufacturer Part Number: PIC16F721-I/SO
• Description: MCU PIC 4K FLASH 20-SOIC
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F721-I/SO

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Core Processor: PIC
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Number Of I /o: 17
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Controller Family/series: PIC16F
• No. Of I/o's: 18
• Ram Memory Size: 256Byte
• Cpu Speed: 16MHz
• No. Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.0
7.1
The oscillator module has a wide variety of clock sources
and selection features that allow it to be used in a wide
range of applications while maximizing performance and
minimizing power consumption.
block diagram of the oscillator module.
Clock sources can be configured from external
oscillators, quartz crystal resonators, ceramic resonators
and Resistor-Capacitor (RC) circuits. In addition, the
system can be configured to use an internal calibrated
high-frequency oscillator as clock source, with a choice
of selectable speeds via software.
FIGURE 7-1:
 2010 Microchip Technology Inc.
Internal Oscillator
CLKIN
500 kHz
OSCILLATOR MODULE
Overview
MFINTOSC
SIMPLIFIED PIC
PLL
32x
(Configuration Word 1)
PLLEN
1
0
Figure 7-1
®
illustrates a
MCU CLOCK SOURCE BLOCK DIAGRAM
16 MHz/500 kHz
2 MHz/62.5 kHz
8 MHz/250 kHz
4 MHz/125 kHz
(OSCCON Register)
IRCF<1:0>
11
10
01
00
Clock source modes are configured by the FOSC bits
in Configuration Word 1 (CONFIG1). The oscillator
module can be configured for one of eight modes of
operation.
1.
2.
3.
4.
EC – CLKOUT function on RA4/CLKOUT pin,
CLKIN on RA5/CLKIN.
EC – I/O function on RA4/CLKOUT pin, CLKIN
on RA5/CLKIN.
INTOSC – CLKOUT function on RA4/CLKOUT
pin, I/O function on RA5/CLKIN
INTOSCIO – I/O function on RA4/CLKOUT pin,
I/O function on RA5/CLKIN
PIC16F/LF720/721
INTOSC
(Configuration Word 1)
EC
FOSC<2:0>
(CPU and Peripherals)
System Clock
DS41430A-page 67