參數(shù)資料
型號(hào): PIC32MX775F256L-80I/BG
廠商: Microchip Technology
文件頁數(shù): 41/64頁
文件大小: 0K
描述: IC MCU 32BIT 256KB FLASH 121XBGA
特色產(chǎn)品: 32-Bit PIC? Microcontroller
PIC32 32-Bit MCU Families
標(biāo)準(zhǔn)包裝: 184
系列: PIC® 32MX
核心處理器: MIPS32? M4K?
芯體尺寸: 32-位
速度: 80MHz
連通性: CAN,以太網(wǎng),I²C,SPI,UART/USART,USB OTG
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,DMA,POR,PWM,WDT
程序存儲(chǔ)器容量: 256KB(256K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 64K 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: 121-TFBGA
包裝: 托盤
產(chǎn)品目錄頁面: 650 (CN2011-ZH PDF)
PIC32MX
DS61145K-page 46
2007-2012 Microchip Technology Inc.
17.4.4
CALCULATING FOR “DIR” IN THE
CHECKSUM FORMULA
The value of Device ID register, its mask value, the
value derived from applying the mask, and the 32-bit
summation of bytes are shown in Table 17-3.
From Table 17-3, the value of “DIR” is:
DIR = 0x00000083 (32-bit number.)
17.4.5
COMPLETING THE PIC32
CHECKSUM CALCULATION
The values derived in previous sections (PF, BF, DCR,
DIR) are used to calculate the checksum value. First,
perform the 32-bit summation of the PF, BF, DCR and
DIR as derived in previous sections and store it in a
variable, called temp, as shown in Example 17-1.
EXAMPLE 17-1:
CHECKSUM CALCULATION PROCESS
17.4.6
CHECKSUM VALUES WHILE
DEVICE IS CODE-PROTECTED
Since the device Configuration Words are not readable
while the PIC32 devices are in code-protected state,
the checksum values are zeros for all devices.
TABLE 17-3:
DIR CALCULATION EXAMPLE
Register
POR Default Value
Mask
POR Default Value
& Mask
32-Bit Summation of
Bytes
DEVID
0x00938053
0x000FF000
0x00038000
0x00000083
1.
First, temp = PF + BF + DCR + DIR, which translates to:
temp = 0x7F80000 + 0x002FC010 + 0x000003D6 + 0x00000083
2.
Adding all four values results in temp being equal to 0x0827C406
3.
Next, the 1’s complement of temp, called temp1, is calculated:
temp1 = 1’s complement (temp), which is now equal to 0xF7D83B96
4.
Finally, the 2’s complement of temp is the checksum:
Checksum = 2’s complement (temp), which is Checksum = temp1 + 1, resulting in 0xF7D83B97
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PIC32MX775F256L-80V/PF 功能描述:32位微控制器 - MCU 256KB 64KBRM USB-OTG 2 CAN ETH 80MHz 10bt 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(shí)鐘頻率:90 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
PIC32MX775F256L-80V/PT 功能描述:32位微控制器 - MCU 256KB 64KBRM USB-OTG 2 CAN ETH 80MHz 10bt 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(shí)鐘頻率:90 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
PIC32MX775F256LT-80I/BG 功能描述:32位微控制器 - MCU 256KB Flash 64KB RAM USB 2xCAN 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(shí)鐘頻率:90 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
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