参数资料
| 型号： | DM163025 |
| 厂商： | Microchip Technology |
| 文件页数： | 14/48页 |
| 文件大小： | 0K |
| 描述： | PIC DEM FULL SPEED USB DEMO BRD |
| 标准包装： | 1 |
| 主要目的： | 接口，USB 2.0 主机/控制器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | PIC18F2455/2550/4455/4550 |
| 主要属性： | 全速（12Mbps） |
| 次要属性： | MPLAB ICE 2000/4000 仿真器接口，温度传感器，扩展和 PICtail 接头 |
| 已供物品： | 板，缆线，CD |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
| 相关产品： | PIC18F4458T-I/PT-ND - IC PIC MCU FLASH 12KX16 44TQFP PIC18F4458T-I/ML-ND - IC PIC MCU FLASH 12KX16 44QFN PIC18F2458T-I/SO-ND - IC PIC MCU FLASH 12KX16 28SOIC PIC18F4458-I/PT-ND - IC PIC MCU FLASH 12KX16 44TQFP PIC18F2458-I/SP-ND - IC PIC MCU FLASH 12KX16 28SDIP PIC18F2458-I/SO-ND - IC PIC MCU FLASH 12KX16 28SOIC PIC18F4458-I/ML-ND - IC PIC MCU FLASH 12KX16 44QFN PIC18F4458-I/P-ND - IC PIC MCU FLASH 12KX16 40DIP PIC18F4553-I/PT-ND - IC PIC MCU FLASH 16KX16 44TQFP PIC18F4553-I/P-ND - IC PIC MCU FLASH 16KX16 40-DIP 更多... |
| 其它名称： | Q2086254 |
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PICDEM ? FS USB User’s Guide
1.4.1
Oscillator and Operating Frequency
The USB module of the PIC18F4550 requires a specific clock frequency input to oper-
ate correctly; specifically, 48 MHz is required when operating in Full-Speed mode, or
6 MHz when operating in Low-Speed mode. The PICDEM FS USB board uses a
20 MHz crystal oscillator as an external clock, and derives the necessary internal clock
frequencies from the 96 MHz PLL module. The clock configuration used on the
demonstration board is shown in Figure 1-2. A detailed explanation of how to set up the
clock configuration is explained in Chapter 2.0 of the PIC18F4550 device data sheet
(DS39632).
The PICDEM FS USB board is configured to run in Full-Speed USB mode, generating
an internal system clock of 48 MHz (equivalent to 12 MIPS) from the external 20 MHz
crystal.
FIGURE 1-2:
PIC18F4550 CLOCK SETUP FOR PICDEM? FS USB
PIC18F4550 Oscillator Block
Y1
Primary
Oscillator
20 MHz
Configurable
Input Prescaler
(configured as
divide-by-5)
4 MHz
1.4.2
Power
96 MHz PLL 96 MHz
(requires 4 MHz
input)
96 MHz
Fixed
Divide-by-2
Configurable
Clock Postscaler
(configured as
divide-by-2)
48 MHz
CPU and
Peripherals
Clock
48 MHz
USB
Clock
The PICDEM FS USB demonstration board operates at 5V. Power can be drawn
directly from the USB bus or from an external power supply. There are no jumpers to
select which power source to use. Instead, the power circuitry automatically selects the
external power source when both power sources are available. Two LEDs, D7 and D8,
are used to indicate the active power source. D7 indicates that the board is operating
in Bus Power mode; D8 indicates Self-Power mode (i.e., an external power supply).
Note:
There are no power conditions that will cause both D7 and D8 to light at the
same time.
Like most USB peripherals, the PICDEM FS USB board can be powered from the 5V
available from the USB cable. A minimum of 100 mA is always available on the bus for
a device; a maximum of 500 mA can be requested and used if available.
A barrel-type power supply connector (2.5 mm diameter) is also provided to run the
board from a 9-18 V DC power supply. A transformer is not supplied in the kit because
every example included will run from USB bus power.
DS51526B-page 10
? 2008 Microchip Technology Inc.
相关PDF资料 |
PDF描述 |
|---|---|
| DM163028 | BOARD DEMO PICDEM LCD |
| DM163029 | BOARD PICDEM FOR MECHATRONICS |
| DM164130-3 | BOARD DEMO FOR PIC16F/PIC18F |
| DM183020 | BOARD DEMO PIC18FXX20 64/80TQFP |
| DM183021 | BOARD DEV PICDEM MC LV |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DM163025-1 | 功能描述:开发板和工具包 - PIC / DSPIC USB DEMO BOARD RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM163026 | 功能描述:开发板和工具包 - PIC / DSPIC L-Pow Sol Demo Brd RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM163027-2 | 功能描述:Zigbee/802.15.4开发工具 PICDEM Z ZIGBEE BRD RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:EM35x 频率:2.4 GHz 接口类型:USB 工作电源电压: |
| DM163027-4 | 功能描述:Zigbee/802.15.4开发工具 PICDEM Z ZIGBEE BRD RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:EM35x 频率:2.4 GHz 接口类型:USB 工作电源电压: |
| DM163027-5 | 功能描述:Zigbee/802.15.4开发工具 PICDEM Z MRF24J40 2.4 GhZ Dev Kit RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:EM35x 频率:2.4 GHz 接口类型:USB 工作电源电压: |
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