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参数资料
| 型号： | PIC32MX575F256LT-80I/PF |
| 厂商： | Microchip Technology |
| 文件页数： | 40/64页 |
| 文件大小： | 0K |
| 描述： | MCU 32BIT 256K FLASH 100TQFP |
| 标准包装： | 1,000 |
| 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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2007-2012 Microchip Technology Inc.
DS61145K-page 45
PIC32MX
The formula to calculate for the checksum for a PIC32
device is provided in Equation 17-1.
EQUATION 17-1:
CHECKSUM FORMULA
17.4
Example of Checksum Calculation
The following five sections demonstrate a checksum
calculation for the PIC32MX360F512L device using
The following assumptions are made for the purpose of
this checksum calculation example:
Program Flash and Boot Flash are in the erased
state (all bytes are 0xFF)
Device Configuration is in the default state of the
device (no configuration changes are made)
To begin, each item on the right-hand side of the equa-
tion (PF, BF, DCR, DIR) is individually calculated. After
those values have been derived, the final value of the
checksum can be determined.
17.4.1
CALCULATING FOR “PF” IN THE
CHECKSUM FORMULA
The size of Program Flash is 512 KB, which equals
524288 bytes. Since the program Flash is assumed to
be in erased state, the value of “PF” is resolved through
the following calculation:
PF = 0xFF + 0xFF + … 524288 times
PF = 0x7F80000 (32-bit number)
17.4.2
CALCULATING FOR “BF” IN THE
CHECKSUM FORMULA
The size of the Boot Flash is 12 KB, which equals
12288 bytes. However, the last 16 bytes are device
Configuration registers, which are treated separately.
Therefore, the number of bytes in boot Flash that we
consider in this step is 12272. Since the boot Flash is
assumed to be in erased state, the value of “BF” is
resolved through the following calculation:
BF = 0xFF + 0xFF + … 12272 times
BF = 0x002FC010 (32-bit number)
17.4.3
CALCULATING FOR “DCR” IN THE
CHECKSUM FORMULA
Since the device Configuration registers are left in their
default state, the value of the appropriate DEVCFG
register – as read by the PIC32 core, its respective
mask value, the value derived from applying the mask,
and the 32-bit summation of bytes (all as shown in
Table 17-2) provide the total of the 32-bit summation of
bytes.
From Table 17-2, the value of “DCR” is:
DCR = 0x000003D6 (32-bit number)
Checksum
2
′s complement PF BF DCR DIR
++
+
()
=
DCR
3
Σ
X
0
=
32-bit summation of bytes MASK
DEVCFGX & DEVCFGx
()
=
DIR
32-bit summation of bytes MASK
DEVID & DEVID
()
=
Where,
PF = 32-bit summation of all bytes in Program Flash
BF = 32-bit summation of all bytes in Boot Flash, except device Configuration registers
TABLE 17-2:
DCR CALCULATION EXAMPLE
Register
POR Default Value
Mask
POR Default Value &
Mask
32-Bit Summation of
Bytes
DEVCFG0
0x7FFFFFFF
0x110FF00B
0x0000011B
DEVCFG1
0xFFFFFFFF
0x009FF7A7
0x0000023D
DEVCFG2
0xFFFFFFFF
0x00070077
0x0000007E
DEVCFG3
0xFFFFFFFF
0x00000000
Total of the 32-bit Summation of Bytes =
0x000003D6
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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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