参数资料
型号: PIC18LF2450T-I/SO
厂商: Microchip Technology
文件页数: 62/143页
文件大小: 0K
描述: IC PIC MCU FLASH 8KX16 28SOIC
标准包装: 1,600
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 48MHz
连通性: UART/USART,USB
外围设备: 欠压检测/复位,HLVD,POR,PWM,WDT
输入/输出数: 23
程序存储器容量: 16KB(8K x 16)
程序存储器类型: 闪存
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 10x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
包装: 带卷 (TR)
PIC18F2450/4450
2006 Microchip Technology Inc.
Advance Information
DS39760A-page 23
2.0
OSCILLATOR
CONFIGURATIONS
2.1
Overview
Devices in the PIC18F2450/4450 family incorporate a
different oscillator and microcontroller clock system
than the non-USB PIC18F devices. The addition of the
USB module, with its unique requirements for a stable
clock source, make it necessary to provide a separate
clock source that is compliant with both USB low-speed
and full-speed specifications.
To accommodate these requirements, PIC18F2450/
4450 devices include a new clock branch to provide a
48 MHz clock for full-speed USB operation. Since it is
driven from the primary clock source, an additional
system of prescalers and postscalers has been added
to accommodate a wide range of oscillator frequencies.
An overview of the oscillator structure is shown in
Other oscillator features used in PIC18 enhanced
microcontrollers, such as the internal RC oscillator and
clock switching, remain the same. They are discussed
later in this chapter.
2.1.1
OSCILLATOR CONTROL
The operation of the oscillator in PIC18F2450/4450
devices
is
controlled
through
two
Configuration
registers and two control registers. Configuration
registers, CONFIG1L and CONFIG1H, select the
oscillator mode and USB prescaler/postscaler options.
As Configuration bits, these are set when the device is
programmed and left in that configuration until the
device is reprogrammed.
The OSCCON register (Register 2-1) selects the Active
Clock mode; it is primarily used in controlling clock
switching in power-managed modes. Its use is
2.2
Oscillator Types
PIC18F2450/4450 devices can be operated in twelve
distinct oscillator modes. In contrast with the non-USB
PIC18 enhanced microcontrollers, four of these modes
involve the use of two oscillator types at once. Users
can program the FOSC3:FOSC0 Configuration bits to
select one of these modes:
1.
XT
Crystal/Resonator
2.
XTPLL
Crystal/Resonator with PLL enabled
3.
HS
High-Speed Crystal/Resonator
4.
HSPLL
High-Speed Crystal/Resonator
with PLL enabled
5.
EC
External Clock with FOSC/4 output
6.
ECIO
External Clock with I/O on RA6
7.
ECPLL
External Clock with PLL enabled
and FOSC/4 output on RA6
8.
ECPIO
External Clock with PLL enabled,
I/O on RA6
9.
INTHS
Internal Oscillator used as
microcontroller clock source, HS
Oscillator used as USB clock source
10. INTXT
Internal Oscillator used as
microcontroller clock source, XT
Oscillator used as USB clock source
11. INTIO
Internal Oscillator used as
microcontroller clock source, EC
Oscillator used as USB clock source,
digital I/O on RA6
12. INTCKO Internal Oscillator used as
microcontroller clock source, EC
Oscillator used as USB clock source,
FOSC/4 output on RA6
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