参数资料
型号: PIC18F24K22T-I/SS
厂商: Microchip Technology
文件页数: 33/71页
文件大小: 0K
描述: IC MCU 8BIT 16KB FLASH 28SSOP
标准包装: 2,100
系列: PIC® XLP™ 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 64MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,HLVD,POR,PWM,WDT
输入/输出数: 24
程序存储器容量: 16KB(8K x 16)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 5.5 V
数据转换器: A/D 19x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
2010-2012 Microchip Technology Inc.
DS41412E-page 39
PIC18(L)F2X/4XK22
2.8
PLL Frequency Multiplier
A Phase-Locked Loop (PLL) circuit is provided as an
option for users who wish to use a lower frequency
oscillator circuit or to clock the device up to its highest
rated frequency from the crystal oscillator. This may be
useful for customers who are concerned with EMI due
to high-frequency crystals or users who require higher
clock speeds from an internal oscillator.
2.8.1
PLL IN EXTERNAL OSCILLATOR
MODES
The PLL can be enabled for any of the external
oscillator modes using the OSC1/OSC2 pins by either
setting the PLLCFG bit (CONFIG1H<4>), or setting the
PLLEN bit (OSCTUNE<6>). The PLL is designed for
input frequencies of 4 MHz up to 16 MHz. The PLL then
multiplies the oscillator output frequency by four to
produce an internal clock frequency up to 64 MHz.
Oscillator frequencies below 4 MHz should not be used
with the PLL.
2.8.2
PLL IN HFINTOSC MODES
The 4x frequency multiplier can be used with the
internal oscillator block to produce faster device clock
speeds than are normally possible with the internal
oscillator. When enabled, the PLL multiplies the
HFINTOSC by four to produce clock rates up to
64 MHz.
Unlike external clock modes, when internal clock
modes are enabled, the PLL can only be controlled
through software. The PLLEN control bit of the
OSCTUNE register is used to enable or disable the
PLL operation when the HFINTOSC is used.
The PLL is designed for input frequencies of 4 MHz up
to 16 MHz.
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