參數(shù)資料
型號： PIC32MX695F512H-80I/MR
廠商： Microchip Technology
文件頁數(shù)： 39/64頁
文件大?。?/td> 0K
描述： IC MCU 32BIT 512KB FLASH 64QFN
特色產(chǎn)品： 32-Bit PIC? Microcontroller
PIC32 32-Bit MCU Families
標準包裝： 40
系列： PIC® 32MX
核心處理器： MIPS32? M4K?
芯體尺寸： 32-位
速度： 80MHz
連通性： 以太網(wǎng)，I²C，SPI，UART/USART，USB OTG
外圍設備： 欠壓檢測/復位，DMA，POR，PWM，WDT
輸入/輸出數(shù)： 53
程序存儲器容量： 512KB（512K x 8）
程序存儲器類型： 閃存
RAM 容量： 128K x 8
電壓 - 電源 (Vcc/Vdd)： 2.3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 16x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 64-VFQFN 裸露焊盤
包裝： 托盤
產(chǎn)品目錄頁面： 650 (CN2011-ZH PDF)
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
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
相關PDF資料
PDF描述
6-100526-9 Z-PACK F.CODING KEY
100526-8 Z-PACK F-CODING KEY
6-100526-3 CONN CODING KEY ORANGE 2MM HM
5-100526-2 Z-PACK F.CODING KEY
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相關代理商/技術參數(shù)
參數(shù)描述
PIC32MX695F512H-80V/MR 功能描述:32位微控制器 - MCU 512KB 128KBR USB-OTG Ethernet 80MHz 10BIT RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:90 MHz 程序存儲器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風格:SMD/SMT
PIC32MX695F512H-80V/PT 功能描述:32位微控制器 - MCU 512KB 128KBR USB-OTG Ethernet 80MHz 10BIT RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:90 MHz 程序存儲器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風格:SMD/SMT
PIC32MX695F512HT-80I/M 制造商:Microchip Technology Inc 功能描述:512KB Flash, 128KB RAM, 80 MHz, USB, ENET, 8 DMA, QFN-64 9X9X0.9mm T/R
PIC32MX695F512HT-80I/MR 功能描述:32位微控制器 - MCU 82 MHz USB ENET 8 DMA RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:90 MHz 程序存儲器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風格:SMD/SMT
PIC32MX695F512HT-80I/P 制造商:Microchip Technology Inc 功能描述:512KB Flash, 128KB RAM, 80 MHz, USB, ENET, 8 DMA, TQFP-64 10X10X1mm T/R
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