PIC16F785-I/SO Microchip Technology, PIC16F785-I/SO Datasheet - Page 31

• 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

3.5
The system clock source can be switched between
external and internal clock sources via software using
the System Clock Select (SCS) bit.
3.5.1
The System Clock Select (SCS) bit, (OSCCON<0>),
selects the system clock source that is used for the
CPU and peripherals.
• When SCS = 0, the system clock source is
• When SCS = 1, the system clock source is
3.5.2
The Oscillator Start-up Time-out Status (OSTS) bit,
(OSCCON<3>), indicates whether the system clock is
running from the external clock source as defined by
the FOSC bits, or from internal clock source. In
particular, OSTS indicates that the Oscillator Start-up
Timer (OST) has timed out for LP, XT or HS modes.
3.6
Two-Speed Start-up mode provides additional power
savings by minimizing the latency between external
oscillator start-up and code execution. In applications
that make heavy use of the Sleep mode, Two-Speed
Start-up will remove the external oscillator start-up
time from the time spent awake and can reduce the
overall power consumption of the device.
This mode allows the application to wake-up from
Sleep, perform a few instructions using the INTOSC
as the clock source and go back to Sleep without wait-
ing for the primary oscillator to become stable.
 2004 Microchip Technology Inc.
determined by configuration of the FOSC<2:0>
bits in Configuration Word (CONFIG).
chosen by the internal oscillator frequency
selected by the IRCF bits. After a Reset, SCS is
always cleared.
Note:
Note:
Clock Switching
Two-Speed Clock Start-up Mode
Executing a SLEEP instruction will abort
the Oscillator Start-up Time and will cause
the OSTS bit (OSCCON<3>) to remain
clear.
SYSTEM CLOCK SELECT (SCS) BIT
Any automatic clock switch, which may
occur
Fail-Safe Clock Monitor, does not update
the SCS bit. The user can monitor the
OSTS (OSCCON<3>) to determine the
current system clock source.
OSCILLATOR START-UP TIME-OUT
STATUS BIT
from
Two-Speed
Start-up
Preliminary
or
When the PIC16F785 is configured for LP, XT, or HS
modes, the Oscillator Start-up Timer (OST) is enabled
(See
(OST)”). The OST timer will suspend program execu-
tion until 1024 oscillations are counted. Two-Speed
Start-up mode minimizes the delay in code execution
by operating from the internal oscillator as the OST is
counting. When the OST count reaches 1024 and the
OSTS bit (OSCCON<3>) is set, program execution
switches to the external oscillator.
3.6.1
Two-Speed Start-up mode is configured by the
following settings:
• IESO = 1 (CONFIG<10>) Internal/External Switch
• SCS = 0.
• F
Two-Speed Start-up mode is entered after:
• Power-on Reset (POR) and, if enabled, after
• Wake-up from Sleep.
If the external clock oscillator is configured to be any-
thing other than LP, XT or HS mode, then Two-Speed
Start-up is disabled. This is because the external clock
oscillator does not require any stabilization time after
POR or an exit from Sleep.
3.6.2
1.
2.
3.
4.
5.
6.
7.
3.6.3
Checking the state of the OSTS bit (OSCCON<3>) will
confirm if the PIC16F785 is running from the external
clock source as defined by the F
Configuration Word (CONFIG) or the internal oscillator.
Over bit.
PWRT has expired, or
OSC
Wake-up from Power-on Reset or Sleep.
Instructions begin execution by the internal
oscillator at the frequency set in the IRCF bits
(OSCCON<6:4>).
OST enabled to count 1024 clock cycles.
OST timed out, wait for falling edge of the
internal oscillator.
OSTS is set.
System clock held low until the next falling edge
of new clock (LP, XT or HS mode).
System clock is switched to external clock
source.
Section 3.3.1 “Oscillator
configured for LP, XT or HS mode.
TWO-SPEED START-UP MODE
CONFIGURATION
TWO-SPEED START-UP
SEQUENCE
CHECKING EXTERNAL/INTERNAL
CLOCK STATUS
PIC16F785
DS41249A-page 29
Start-up Timer
OSC
bits in the