参数资料
| 型号： | DM163025 |
| 厂商： | Microchip Technology |
| 文件页数： | 26/48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
3.5
BOOTLOAD MODE
The Bootload mode provides a simple means of reprogramming the on-board
microcontroller without using an external programming device. The PICDEM FS USB
board is preprogrammed with a bootload program that allows designers to download
and test new code through the Demo Tool application.
This section describes the Bootload mode, as well as a brief overview of the architec-
ture of the bootload program. An understanding on how the bootload firmware coexists
with the user firmware is important in developing a successful end application.
3.5.1
Bootload Mode Entry
To start using the application, press and hold S2 while resetting the board (pressing and
releasing S1). The entry condition on the PICDEM FS USB board and the provided
firmware is determined by the status of the switch button, S2, which is checked once
after each Reset. If the button is held down during a Reset, the microcontroller enters
the Bootload mode; otherwise, it starts executing user code from address 0x0800.
Note:
Even if the Demo Tool application is running in Bootload mode, a simple
reset of the board (pressing S1) will not cause the board itself to enter
Bootload mode.
After the Reset, select “PICDEM FS USB 0 (Boot)” from the “Select PICDEM FS USB
Board” dropdown box. When the Demo Tool application successfully connects to the
board, the message “USB Bootload Firmware Version x.x” will appear on the left side
of the status bar at the bottom of the window.
3.5.2
Memory Organization
Program Memory Usage
gram memory are reserved as the boot block, which is utilized almost entirely for the
bootloader firmware. The bootloader is a self-contained program with its own USB
driver firmware, USB descriptor set, bootload command interpreter and bootload
function handlers. The USB driver firmware used with the bootloader is a modified
version of the Microchip USB firmware framework library, and incorporates a smaller
set of features and more static design.
The boot block can be write-protected to prevent accidental overwriting of the boot
program. The default setting from factory has the boot block write-protect option
enabled.
Remapped Vectors
Since the hardware Reset and interrupt vectors lie within the boot area and cannot be
edited if the block is write-protected, they are remapped through software to the
nearest parallel location outside the boot block: 0x0800 for Reset, 0x0808 for the
high-priority interrupt vector and 0x0818 for the low-priority interrupt vector. Remapping
is simply a GOTO instruction for interrupts. Users should note that an additional latency
of two instruction cycles is required to handle interrupts.
DS51526B-page 22
? 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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