PIC16F785-I/SO Microchip Technology, PIC16F785-I/SO Datasheet - Page 25

• Manufacturer Part Number: PIC16F785-I/SO
• Description: IC PIC MCU FLASH 2KX14 20SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F785-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 20-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• 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 ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: RS- 232/USB
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 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, DV164120, DM163029
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT20SO1-1 - SOCKET TRANS ICE 20DIP TO 20SOICXLT18SO-1 - SOCKET TRANSITION 18SOIC 300MILAC162060 - HEADER INTRFC MPLAB ICD2 20PINAC164039 - MODULE SKT PROMATE II 20DIP/SOIC
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.0
3.1
The PIC16F785 has a wide variety of clock sources
and selection features to allow it to be used in a wide
range of applications while maximizing performance
and
illustrates a block diagram of the PIC16F785 clock
sources.
Clock sources can be configured from external
oscillators,
resonators and resistor-capacitor (RC) circuits. In
addition, the system clock source can be configured
from one of two internal oscillators, with a choice of
speeds selectable via software. Additional clock
features include:
• Selectable system clock source between external
• Two-speed Clock Start-up mode, which minimizes
• Fail-Safe Clock Monitor (FSCM) designed to
FIGURE 3-1:
 2004 Microchip Technology Inc.
or internal via software.
latency between external oscillator start-up and
code execution.
detect a failure of the external clock source (LP,
XT, HS, EC or RC modes) and switch to the inter-
nal oscillator.
OSC2
OSC1
minimizing
CLOCK SOURCES
Overview
quartz
External Oscillator
Internal Oscillator
power
HFINTOSC
LFINTOSC
31 kHz
8 MHz
PIC16F785 CLOCK SOURCE BLOCK DIAGRAM
crystal
consumption.
Sleep
resonators,
Figure 3-1
ceramic
500 kHz
250 kHz
125 kHz
31 kHz
8 MHz
4 MHz
2 MHz
1 MHz
Preliminary
(OSCCON<6:4>)
IRCF<2:0>
111
110
101
100
011
010
001
000
The PIC16F785 can be configured in one of eight clock
modes.
1.
2.
3.
4.
5.
6.
7.
8.
Clock source modes are configured by the FOSC<2:0>
bits in the Configuration Word (See Section 15.0
“Special
PIC16F785 is programmed and the clock source mode
configured, it cannot be changed in software.
LP, XT, HS, RC, RCIO, EC
EC - External clock with I/O on RA4.
LP - 32.768 kHz watch crystal or ceramic
resonator oscillator mode.
XT - Medium gain crystal or ceramic resonator
oscillator mode.
HS - High gain crystal or ceramic resonator
mode.
RC - External Resistor-Capacitor (RC) with
F
RCIO - External Resistor-Capacitor with I/O on
RA4.
INTOSC - Internal Oscillator with F
on RA4 and I/O on RA5.
INTOSCIO - Internal Oscillator with I/O on RA4
and RA5.
OSC
/4 output on RA4
Features
Power-up Timer (PWRT)
Watchdog Timer (WDT)
Fail-Safe Clock Monitor (FSCM)
(Configuration Word)
(OSCCON<0>)
of
FOSC<2:0>
PIC16F785
SCS
the
(CPU and Peripherals)
CPU”).
DS41249A-page 23
System Clock
OSC
/4 output
Once
the