參數(shù)資料
型號： PIC16F785
廠商： Microchip Technology Inc.
英文描述： 20-Pin Flash-Based 8-Bit CMOS Microcontroller with Two-Phase Asychronous Feedback PWM, Dual High-Speed Comparators and Dual Operational Amplifiers
中文描述： 20引腳基于閃存的8兩相異步反饋的PWM，雙高位CMOS微控制器的高速比較器和雙運算放大器
文件頁數(shù)： 31/178頁
文件大小： 1620K
代理商： PIC16F785
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2004 Microchip Technology Inc.
Preliminary
DS41249A-page 29
PIC16F785
3.5
Clock Switching
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
SYSTEM CLOCK SELECT (SCS) BIT
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
determined by configuration of the FOSC<2:0>
bits in Configuration Word (CONFIG).
When SCS =
1
, the system clock source is
chosen by the internal oscillator frequency
selected by the IRCF bits. After a Reset, SCS is
always cleared.
3.5.2
OSCILLATOR START-UP TIME-OUT
STATUS BIT
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 Clock Start-up Mode
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.
When the PIC16F785 is configured for LP, XT, or HS
modes, the Oscillator Start-up Timer (OST) is enabled
(See
Section 3.3.1 “Oscillator Start-up Timer
(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
CONFIGURATION
Two-Speed Start-up mode is configured by the
following settings:
IESO =
1
(CONFIG<10>) Internal/External Switch
Over bit.
SCS =
0
.
F
OSC
configured for LP, XT or HS mode.
Two-Speed Start-up mode is entered after:
Power-on Reset (POR) and, if enabled, after
PWRT has expired, or
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
TWO-SPEED START-UP
SEQUENCE
1.
2.
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.
3.
4.
5.
6.
7.
3.6.3
CHECKING EXTERNAL/INTERNAL
CLOCK STATUS
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
OSC
bits in the
Configuration Word (CONFIG) or the internal oscillator.
Note:
Any automatic clock switch, which may
occur from Two-Speed Start-up or
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.
Note:
Executing a
SLEEP
instruction will abort
the Oscillator Start-up Time and will cause
the OSTS bit (OSCCON<3>) to remain
clear.
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參數(shù)描述
PIC16F785-E/ML 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F785-E/P 功能描述:8位微控制器 -MCU 14KB 368 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F785-E/SO 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F785-E/SS 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F785-I/ML 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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