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| 型号： | PIC12F1840-I/SN |
| 厂商： | Microchip Technology |
| 文件页数： | 71/122页 |
| 文件大小： | 0K |
| 描述： | MCU 7KB FLASH 256B RAM 8-SOIC |
| 产品培训模块： | 8-bit PIC® Microcontroller Portfolio |
| 标准包装： | 100 |
| 系列： | PIC® XLP™ 12F |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 32MHz |
| 连通性： | I²C，LIN，SPI，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 5 |
| 程序存储器容量： | 7KB（4K x 14） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 256 x 8 |
| RAM 容量： | 256 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.3 V ~ 5.5 V |
| 数据转换器： | A/D 4x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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PIC12(L)F1840
DS41441B-page 52
Preliminary
2011 Microchip Technology Inc.
5.2.2
INTERNAL CLOCK SOURCES
The device may be configured to use the internal oscil-
lator block as the system clock by performing one of the
following actions:
Program the FOSC<2:0> bits in Configuration
Word 1 to select the INTOSC clock source, which
will be used as the default system clock upon a
device Reset.
Write the SCS<1:0> bits in the OSCCON register
to switch the system clock source to the internal
oscillator during run-time. See Section 5.3
for more information.
In INTOSC mode, OSC1/CLKIN is available for general
purpose I/O. OSC2/CLKOUT is available for general
purpose I/O or CLKOUT.
The function of the OSC2/CLKOUT pin is determined
by the state of the CLKOUTEN bit in Configuration
Word 1.
The internal oscillator block has two independent
oscillators and a dedicated Phase-Locked Loop,
HFPLL that can produce one of three internal system
clock sources.
1.
The
HFINTOSC
(High-Frequency
Internal
Oscillator) is factory calibrated and operates at
16 MHz. The HFINTOSC source is generated
from the 500 kHz MFINTOSC source and the
dedicated Phase-Locked Loop, HFPLL. The
frequency
of
the
HFINTOSC
can
be
user-adjusted via software using the OSCTUNE
register (Register 5-3).
2.
The MFINTOSC (Medium-Frequency Internal
Oscillator) is factory calibrated and operates at
500 kHz. The frequency of the MFINTOSC can
be user-adjusted via software using the
OSCTUNE register (Register 5-3).
3.
The
LFINTOSC
(Low-Frequency
Internal
Oscillator) is uncalibrated and operates at
31 kHz.
5.2.2.1
HFINTOSC
The High-Frequency Internal Oscillator (HFINTOSC) is
a factory calibrated 16 MHz internal clock source. The
frequency of the HFINTOSC can be altered via
software using the OSCTUNE register (Register 5-3).
The output of the HFINTOSC connects to a postscaler
and multiplexer (see Figure 5-1). One of nine
frequencies derived from the HFINTOSC can be
selected via software using the IRCF<3:0> bits of the
OSCCON register. See Section 5.2.2.7 “Internal
for more information.
The HFINTOSC is enabled by:
Configure the IRCF<3:0> bits of the OSCCON
register for the desired HF frequency, and
FOSC<2:0> = 100, or
Set the System Clock Source (SCS) bits of the
OSCCON register to ‘1x’.
The High Frequency Internal Oscillator Ready bit
(HFIOFR) of the OSCSTAT register indicates when the
HFINTOSC is running and can be utilized.
The High Frequency Internal Oscillator Status Locked
bit (HFIOFL) of the OSCSTAT register indicates when
the HFINTOSC is running within 2% of its final value.
The High Frequency Internal Oscillator Status Stable
bit (HFIOFS) of the OSCSTAT register indicates when
the HFINTOSC is running within 0.5% of its final value.
5.2.2.2
MFINTOSC
The
Medium-Frequency
Internal
Oscillator
(MFINTOSC) is a factory calibrated 500 kHz internal
clock source. The frequency of the MFINTOSC can be
altered via software using the OSCTUNE register
(Register 5-3).
The output of the MFINTOSC connects to a postscaler
and multiplexer (see Figure 5-1). One of nine
frequencies derived from the MFINTOSC can be
selected via software using the IRCF<3:0> bits of the
OSCCON register. See Section 5.2.2.7 “Internal
for more information.
The MFINTOSC is enabled by:
Configure the IRCF<3:0> bits of the OSCCON
register for the desired HF frequency, and
FOSC<2:0> = 100, or
Set the System Clock Source (SCS) bits of the
OSCCON register to ‘1x’
The Medium Frequency Internal Oscillator Ready bit
(MFIOFR) of the OSCSTAT register indicates when the
MFINTOSC is running and can be utilized.
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