參數(shù)資料
型號(hào): PIC16F526-I/P
廠商: Microchip Technology
文件頁(yè)數(shù): 53/122頁(yè)
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 1KX12 14DIP
標(biāo)準(zhǔn)包裝: 30
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 11
程序存儲(chǔ)器容量: 1.5KB(1K x 12)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 67 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 3x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 14-DIP(0.300",7.62mm)
包裝: 管件
產(chǎn)品目錄頁(yè)面: 638 (CN2011-ZH PDF)
配用: AC162096-ND - HEADER MPLAB ICD2 PIC16F526 8/14
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PIC18F2221/2321/4221/4321 FAMILY
DS39689F-page 36
2009 Microchip Technology Inc.
3.7.1
OSCILLATOR CONTROL REGISTER
The OSCCON register (Register 3-2) controls several
aspects of the device clock’s operation, both in full
power operation and in power-managed modes.
The System Clock Select bits, SCS<1:0>, select the
clock source. The available clock sources are the
primary clock (defined by the FOSC<3:0> Configura-
tion bits), the secondary clock (Timer1 oscillator) and
the internal oscillator block. The clock source changes
immediately after either of the SCS<1:0> bits are
changed, following a brief clock transition interval. The
SCS bits are reset on all forms of Reset.
The
Internal
Oscillator
Frequency
Select
bits
(IRCF<2:0>) select the frequency output of the internal
oscillator block to drive the device clock. The choices
are the INTRC source (31 kHz), the INTOSC source
(8 MHz) or one of the frequencies derived from the
INTOSC postscaler (31.25 kHz to 4 MHz). If the
internal oscillator block is supplying the device clock,
changing the states of these bits will have an immedi-
ate change on the internal oscillator’s output. On
device Resets, the default output frequency of the
internal oscillator block is set at 1 MHz.
When a nominal output frequency of 31 kHz is selected
(IRCF<2:0> = 000), users may choose which internal
oscillator acts as the source. This is done with the
INTSRC bit in the OSCTUNE register (OSCTUNE<7>).
Setting this bit selects INTOSC as a 31.25 kHz clock
source derived from the INTOSC postscaler. Clearing
INTSRC selects INTRC (nominally 31 kHz) as the
clock source and disables the INTOSC to reduce
current consumption.
This option allows users to select the tunable and more
precise INTOSC as a clock source, while maintaining
power savings with a very low clock speed. Addition-
ally, the INTOSC source will already be stable should a
switch to a higher frequency be needed quickly.
Regardless of the setting of INTSRC, INTRC always
remains the clock source for features such as the
Watchdog Timer and the Fail-Safe Clock Monitor.
The OSTS, IOFS and T1RUN bits indicate which clock
source is currently providing the device clock. The
OSTS bit indicates that the Oscillator Start-up Timer
and PLL Start-up Timer (if enabled) have timed out and
the primary clock is providing the device clock in
primary clock modes. The IOFS bit indicates when the
internal oscillator block has stabilized and is providing
the device clock in RC Clock modes. The T1RUN bit
(T1CON<6>) indicates when the Timer1 oscillator is
providing the device clock in secondary clock modes.
In power-managed modes, only one of these three bits
will be set at any time. If none of these bits are set, the
INTRC is providing the clock or the internal oscillator
block has just started and is not yet stable.
The IDLEN bit controls whether the device goes into
Sleep mode or one of the Idle modes when the SLEEP
instruction is executed.
The use of the flag and control bits in the OSCCON
register is discussed in more detail in Section 4.0
3.7.2
OSCILLATOR TRANSITIONS
The PIC18F2221/2321/4221/4321 family of devices con-
tains circuitry to prevent clock “glitches” when switching
between clock sources. A short pause in the device clock
occurs during the clock switch. The length of this pause
is the sum of two cycles of the old clock source and three
to four cycles of the new clock source. This formula
assumes that the new clock source is stable.
Clock transitions are discussed in greater detail in
Note 1: The Timer1 oscillator must be enabled to
select the secondary clock source. The
Timer1 oscillator is enabled by setting the
T1OSCEN bit in the Timer1 Control regis-
ter (T1CON<3>). If the Timer1 oscillator
is not enabled, then any attempt to select
a secondary clock source will be ignored.
2: It is recommended that the Timer1
oscillator be operating and stable before
selecting the secondary clock source or a
very long delay may occur while the
Timer1 oscillator starts.
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PIC16F526T-I/MG 功能描述:8位微控制器 -MCU 1.5KB 64B 8MHz Internal Oscillator 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
PIC16F526T-I/SL 功能描述:8位微控制器 -MCU 15KB 64B 8MHz 8B ADC Internal Oscillator 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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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PIC16F526T-I/SL031 制造商:Microchip Technology Inc 功能描述:
PIC16F526T-I/SL033 制造商:Microchip Technology Inc 功能描述: