參數(shù)資料
型號： PIC16LF721-I/P
廠商： Microchip Technology
文件頁數(shù)： 101/135頁
文件大?。?/td> 0K
描述： MCU PIC 4K FLASH 20-DIP
產(chǎn)品培訓(xùn)模塊： 8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝： 22
系列： PIC® XLP™ 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 16MHz
連通性： I²C，SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 17
程序存儲器容量： 7KB（4K x 14）
程序存儲器類型： 閃存
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 12x8b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-DIP（0.300"，7.62mm）
包裝： 管件
PIC16(L)F720/721
DS41430C-page 68
Preliminary
2010-2011 Microchip Technology Inc.
7.2
Clock Source Modes
Clock source modes can be classified as external or
internal.
Internal clock source (INTOSC) is contained
within the oscillator module and derived from a
500 kHz high precision oscillator. The oscillator
module has eight selectable output frequencies,
with a maximum internal frequency of 16 MHz.
The external clock mode (EC) relies on an
external signal for the clock source.
The system clock can be selected between external or
internal clock sources via the FOSC bits of the
Configuration Word 1.
7.3
Internal Clock Modes
The oscillator module has eight output frequencies
derived from a 500 kHz high precision oscillator. The
IRCF bits of the OSCCON register select the
postscaler applied to the clock source dividing the
frequency by 1, 2, 4 or 8. Setting the PLLEN bit of the
Configuration Word 1 locks the internal clock source to
16 MHz before the postscaler is selected by the IRCF
bits. The PLLEN bit must be set or cleared at the time
of programming; therefore, only the upper or low four
clock source frequencies are selectable in software.
The internal oscillator block has one internal oscillator
and a dedicated Phase Locked Loop that are used to
generate two internal system clock sources: the 16
MHz High-Frequency Internal Oscillator (HFINTOSC)
and the 500 kHz (MFINTOSC). Both can be user-
adjusted via software using the OSCTUNE register
7.3.1
INTOSC AND INTOSCIO MODES
The INTOSC and INTOSCIO modes configure the
internal oscillators as the system clock source when
the device is programmed using the oscillator selection
or the FOSC<1:0> bits in the CONFIG1 register. See
for
more
information.
In INTOSC mode, CLKIN is available for general
purpose I/O. CLKOUT outputs the selected internal
oscillator frequency divided by 4. The CLKOUT signal
may be used to provide a clock for external circuitry,
synchronization, calibration, test or other application
requirements.
In INTOSCIO mode, CLKIN and CLKOUT are available
for general purpose I/O.
7.3.2
FREQUENCY SELECT BITS (IRCF)
The output of the 500 kHz MFINTOSC and 16 MHz
HFINTOSC, with Phase Locked Loop enabled, connect
to a postscaler and multiplexer (see Figure 7-1). The
Internal Oscillator Frequency Select bits (IRCF) of the
OSCCON register select the frequency output of the
internal oscillator. Depending upon the PLLEN bit, one
of four frequencies of two frequency sets can be
selected via software:
If PLLEN = 1, HFINTOSC frequency selection is as
follows:
16 MHz
8 MHz (default after Reset)
4 MHz
2 MHz
If PLLEN = 0, MFINTOSC frequency selection is as
follows:
500 kHz
250 kHz (default after Reset)
125 kHz
62.5 kHz
There is no start-up delay before a new frequency
selected in the IRCF bits takes effect. This is because
the old and new frequencies are derived from INTOSC
via the postscaler and multiplexer.
Start-up delay specifications are located in the
in
Note:
Following any Reset, the IRCF<1:0> bits
of the OSCCON register are set to ‘10’ and
the frequency selection is set to 8 MHz or
250 kHz. The user can modify the IRCF
bits to select a different frequency.
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