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参数资料
| 型号： | PIC32MX575F256LT-80I/PT |
| 厂商： | Microchip Technology |
| 文件页数： | 39/64页 |
| 文件大小： | 0K |
| 描述： | IC MCU 32BIT 256KB FLASH 100TQFP |
| 标准包装： | 1,200 |
| 系列： | PIC® 32MX |
| 核心处理器： | MIPS32? M4K? |
| 芯体尺寸： | 32-位 |
| 速度： | 80MHz |
| 连通性： | CAN，I²C，SPI，UART/USART，USB OTG |
| 外围设备： | 欠压检测/复位，DMA，POR，PWM，WDT |
| 输入/输出数： | 85 |
| 程序存储器容量： | 256KB（256K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 64K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.3 V ~ 3.6 V |
| 数据转换器： | A/D 16x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 100-TQFP |
| 包装： | 带卷 (TR) |
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PIC32MX
DS61145K-page 44
2007-2012 Microchip Technology Inc.
17.3
Algorithm
An example of a high-level algorithm for calculating the
checksum for a PIC32 device is illustrated in Figure 17-1
to demonstrate one method to derive a checksum. This
is merely an example of how the actual calculations can
be accomplished, the method that is ultimately used is
left to the discretion of the software developer.
As stated earlier, the PIC32 checksum is calculated as
the 32-bit summation of all bytes (8-bit quantities) in
program
Flash,
boot
Flash
(except
device
Configuration Words), the Device ID register with
applicable mask, and the device Configuration Words
with applicable masks.
Next, the 2’s complement of the summation is
calculated. This final 32-bit number is presented as the
checksum.
The mask values of the device Configuration and
Device ID registers are derived as described in the
previous section, Section 17.2 “Mask Values”.
Another noteworthy point is that the last four 32-bit
quantities in boot Flash are the device Configuration
registers. An arithmetic AND operation of these device
Configuration register values is performed with the
appropriate mask value, before adding their bytes to
the checksum.
Similarly, an arithmetic AND operation of the Device ID
register is performed with the appropriate mask value,
before adding its bytes to the checksum.
FIGURE 17-1:
HIGH-LEVEL ALGORITHM FOR CHECKSUM CALCULATION
pic32_checksum
Read Program Flash, Boot Flash (including DEVCFG
registers) and DEVID register in tempBuffer
Apply DEVCFG and DEVID masks to appropriate
locations in tempBuffer
tmpChecksum (32-bit quantity) = 0
Finish processing all
bytes (8-bit quantities) in
tempBuffer?
tmpChecksum = tempChecksum + Current Byte Value
(8-bit quantity) in tmpBuffer
Checksum (32-bit quantity) = 2’s complement
of tmpChecksum
Done
No
Yes
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC32MX575F256LT-80V/BG | 功能描述:32位微控制器 - MCU 256KB 64KBRM USB-OTG CAN 80MHz 10BIT RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| PIC32MX575F256LT-80V/PF | 功能描述:32位微控制器 - MCU 256KB 64KBRM USB-OTG CAN 80MHz 10BIT RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| PIC32MX575F256LT-80V/PT | 功能描述:32位微控制器 - MCU 256KB 64KBRM USB-OTG CAN 80MHz 10BIT RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| PIC32MX575F512H | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:High-Performance, USB, CAN and Ethernet 32-bit Flash Microcontrollers |
| PIC32MX575F512H-80I | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PIC32MX575FXXXX USB, CAN and Ethernet 32-bit Flash Microcontroller |
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