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| 型号： | PIC16F767-E/ML |
| 厂商： | Microchip Technology |
| 文件页数： | 206/231页 |
| 文件大小： | 0K |
| 描述： | IC PIC MCU FLASH 8KX14 28QFN |
| 产品培训模块： | Asynchronous Stimulus |
| 标准包装： | 61 |
| 系列： | PIC® 16F |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 20MHz |
| 连通性： | I²C，SPI，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 25 |
| 程序存储器容量： | 14KB（8K x 14） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 368 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 4 V ~ 5.5 V |
| 数据转换器： | A/D 11x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-VQFN 裸露焊盘 |
| 包装： | 管件 |
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2004 Microchip Technology Inc.
DS30498C-page 37
PIC16F7X7
4.6
Clock Sources and Oscillator
Switching
The PIC16F7X7 devices include a feature that allows
the system clock source to be switched from the main
oscillator to an alternate low-frequency clock source.
PIC16F7X7 devices offer three alternate clock sources.
When enabled, these give additional options for
switching to the various power-managed operating
modes.
Essentially, there are three clock sources for these
devices:
Primary oscillators
Secondary oscillators
Internal oscillator block (INTRC)
The primary oscillators include the External Crystal
and Resonator modes, the External RC modes, the
External Clock mode and the internal oscillator block.
The particular mode is defined on POR by the contents
of Configuration Word 1. The details of these modes
are covered earlier in this chapter.
The secondary oscillators are those external sources
not connected to the OSC1 or OSC2 pins. These
sources may continue to operate even after the
controller is placed in a power-managed mode.
PIC16F7X7 devices offer the Timer1 oscillator as a
secondary oscillator. This oscillator continues to run
when a SLEEP instruction is executed and is often the
time base for functions, such as a real-time clock.
Most often, a 32.768 kHz watch crystal is connected
between the RC0/T1OSO/T1CKI and RC1/T1OSI/CCP2
pins. Like the LP mode oscillator circuit, loading capaci-
tors are also connected from each pin to ground. The
Timer1 oscillator is discussed in greater detail in
In addition to being a primary clock source, the internal
oscillator block is available as a power-managed
mode clock source. The 31.25 kHz INTRC source is
also used as the clock source for several special
features, such as the WDT, Fail-Safe Clock Monitor,
Power-up Timer and Two-Speed Start-up.
The clock sources for the PIC16F7X7 devices are shown
in Figure 4-6. See Section 7.0 “Timer1 Module” for
further details of the Timer1 oscillator. See Section 15.1
“Configuration Bits” for Configuration register details.
4.6.1
OSCCON REGISTER
The OSCCON register (Register 4-2) controls several
aspects of the system clock’s operation, both in full
power operation and in power-managed modes.
The system clock select bits, SCS1:SCS0, select the
clock source that is used when the device is operating
in power-managed modes. When the bits are cleared
(SCS<1:0> = 00), the system clock source comes from
the
main
oscillator
that
is
selected
by
the
FOSC2:FOSC0 configuration bits in Configuration
Register 1. When the bits are set in any other manner,
the system clock source is provided by the Timer1
oscillator (SCS1:SCS0 = 01) or from the internal
oscillator block (SCS1:SCS0 = 10). After a Reset,
SCS<1:0> are always set to ‘00’.
The internal oscillator select bits, IRCF2:IRCF0, select
the frequency output of the internal oscillator block that
is used to drive the system clock. The choices are the
INTRC source (31.25 kHz), the INTOSC source
(8 MHz) or one of the six frequencies derived from the
INTOSC postscaler (125 kHz to 4 MHz). Changing the
configuration of these bits has an immediate change on
the multiplexor’s frequency output.
The OSTS and IOFS bits indicate the status of the
primary oscillator and INTOSC source; these bits are
set when their respective oscillators are stable. In
particular, OSTS indicates that the Oscillator Start-up
Timer has timed out.
4.6.2
CLOCK SWITCHING
Clock switching will occur for the following reasons:
The FCMEN (CONFIG2<0>) bit is set, the device
is running from the primary oscillator and the
primary oscillator fails. The clock source will be
the internal RC oscillator.
The FCMEN bit is set, the device is running from
the Timer1 oscillator (T1OSC) and T1OSC fails.
The clock source will be the internal RC oscillator.
Following a wake-up due to a Reset or a POR,
when the device is configured for Two-Speed
Start-up mode, switching will occur between the
INTRC and the system clock defined by the
FOSC<2:0> bits.
A wake-up from Sleep occurs due to interrupt or
WDT wake-up and Two-Speed Start-up is
enabled. If the primary clock is XT, HS or LP, the
clock will switch between the INTRC and the
primary system clock after 1024 clocks and
8 clocks of the primary oscillator. This is
conditional upon the SCS bits being set equal
to ‘00’.
SCS bits are modified from their original value.
IRCF bits are modified from their original value.
Note:
Because the SCS bits are cleared on any
Reset, no clock switching will occur on a
Reset unless the Two-Speed Start-up is
enabled and the primary clock is XT, HS or
LP. The device will wait for the primary
clock to become stable before execution
begins (Two-Speed Start-up disabled).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC16F767-I/ML | 功能描述:8位微控制器 -MCU 14KB 368 RAM 25 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F767-I/SO | 功能描述:8位微控制器 -MCU 14KB 368 RAM 25 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F767-I/SO | 制造商:Microchip Technology Inc 功能描述:ICS MICROCONTROLLERS NUMBER OF I/OS:25 |
| PIC16F767-I/SP | 功能描述:8位微控制器 -MCU 14KB 368 RAM 25 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F767-I/SP | 制造商:Microchip Technology Inc 功能描述:8-Bit Microcontroller IC |
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