PIC16F631-I/P Microchip Technology Inc., PIC16F631-I/P Datasheet - Page 57
![no-image](/images/manufacturer_photos/0/4/440/microchip_technology_inc__sml.jpg)
PIC16F631-I/P
Manufacturer Part Number
PIC16F631-I/P
Description
MCU, 8-Bit, 1KW Flash, 64 RAM, 18 I/O, PDIP-20
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F631-IP.pdf
(294 pages)
Specifications of PIC16F631-I/P
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
128 Bytes
Input Output
18
Memory Type
Flash
Number Of Bits
8
Package Type
20-pin PDIP
Programmable Memory
1.75K Bytes
Ram Size
64 Bytes
Speed
20 MHz
Timers
1-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F631-I/P
Manufacturer:
MICROCHIP
Quantity:
4 500
Part Number:
PIC16F631-I/P
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
- Current page: 57 of 294
- Download datasheet (6Mb)
3.6
The system clock source can be switched between
external and internal clock sources via software using
the System Clock Select (SCS) bit of the OSCCON
register.
3.6.1
The System Clock Select (SCS) bit of the OSCCON
register selects the system clock source that is used for
the CPU and peripherals.
• When the SCS bit of the OSCCON register = 0,
• When the SCS bit of the OSCCON register = 1,
3.6.2
The Oscillator Start-up Time-out Status (OSTS) bit of
the OSCCON register indicates whether the system
clock is running from the external clock source, as
defined by the FOSC<2:0> bits in the Configuration
Word register (CONFIG), or from the internal clock
source. In particular, OSTS indicates that the Oscillator
Start-up Timer (OST) has timed out for LP, XT or HS
modes.
3.7
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
waiting for the primary oscillator to become stable.
© 2007 Microchip Technology Inc.
the system clock source is determined by
configuration of the FOSC<2:0> bits in the
Configuration Word register (CONFIG).
the system clock source is chosen by the internal
oscillator frequency selected by the IRCF<2:0>
bits of the OSCCON register. After a Reset, the
SCS bit of the OSCCON register is always
cleared.
Note:
Note:
Clock Switching
Two-Speed Clock Start-up Mode
SYSTEM CLOCK SELECT (SCS) BIT
Any automatic clock switch, which may
occur from Two-Speed Start-up or Fail-Safe
Clock Monitor, does not update the SCS bit
of the OSCCON register. The user can
monitor the OSTS bit of the OSCCON
register to determine the current system
clock source.
OSCILLATOR START-UP TIME-OUT
STATUS (OSTS) BIT
Executing a SLEEP instruction will abort
the oscillator start-up time and will cause
the OSTS bit of the OSCCON register to
remain clear.
PIC16F631/677/685/687/689/690
When the Oscillator module is configured for LP, XT or
HS modes, the Oscillator Start-up Timer (OST) is
enabled (see Section 3.4.1 “Oscillator Start-up Timer
(OST)”). The OST will suspend program execution 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 of the OSCCON register is set, program
execution switches to the external oscillator.
3.7.1
Two-Speed Start-up mode is configured by the
following settings:
• IESO (of the Configuration Word register) = 1;
• SCS (of the OSCCON register) = 0.
• FOSC<2:0> bits in the Configuration Word
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
anything 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.
3.7.2
1.
2.
3.
4.
5.
6.
7.
Internal/External Switchover bit (Two-Speed Start-
up mode enabled).
register (CONFIG) configured for LP, XT or HS
mode.
Power-up Timer (PWRT) has expired, or
Wake-up from Power-on Reset or Sleep.
Instructions begin execution by the internal
oscillator at the frequency set in the IRCF<2:0>
bits of the OSCCON register.
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.
TWO-SPEED START-UP MODE
CONFIGURATION
TWO-SPEED START-UP
SEQUENCE
DS41262D-page 55
Related parts for PIC16F631-I/P
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![PIC16F1507-E/ML](/photos/16/3/160361/qfn20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 QFN 4x4mm TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507-E/P](/photos/16/12/161290/pdip20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 PDIP .300in TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507-E/SO](/photos/16/12/161297/soic20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 SOIC .300in TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507-E/SS](/photos/16/12/161299/ssop20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 SSOP .209in TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507-I/ML](/photos/16/3/160361/qfn20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 QFN 4x4mm TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507-I/P](/photos/16/12/161290/pdip20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 PDIP .300in TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507-I/SO](/photos/16/12/161297/soic20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 SOIC .300in TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507-I/SS](/photos/16/12/161299/ssop20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 SSOP .209in TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507T-I/ML](/photos/16/3/160361/qfn20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 QFN 4x4mm T/R
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507T-I/SO](/photos/16/12/161297/soic20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 SOIC .300in T/R
Manufacturer:
Microchip Technology
Datasheet:
![PIC16F1507T-I/SS](/photos/16/12/161299/ssop20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 SSOP .209in T/R
Manufacturer:
Microchip Technology
Datasheet:
![PIC16LF1507-E/ML](/photos/16/3/160361/qfn20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 QFN 4x4mm TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16LF1507-E/P](/photos/16/12/161290/pdip20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 PDIP .300in TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16LF1507-E/SO](/photos/16/12/161297/soic20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 SOIC .300in TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC16LF1507-E/SS](/photos/16/12/161299/ssop20_tmb.jpg)
Part Number:
Description:
3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 SSOP .209in TUBE
Manufacturer:
Microchip Technology
Datasheet: