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參數(shù)資料
| 型號： | DS80C400-FNY |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 91/97頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 75MHZ 16MB HP 100-LQFP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS |
| 產(chǎn)品變化通告： | Product Discontinuation 20/Feb/2012 |
| 標準包裝： | 90 |
| 系列： | 80C |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 75MHz |
| 連通性： | 1 線，CAN，EBI/EMI，以太網(wǎng)，SIO，UART/USART |
| 外圍設(shè)備： | 電源故障復(fù)位，WDT |
| 輸入/輸出數(shù)： | 64 |
| 程序存儲器容量： | 64KB（64K x 8） |
| 程序存儲器類型： | ROM |
| RAM 容量： | 1K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.62 V ~ 3.6 V |
| 振蕩器型： | 外部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 100-LQFP |
| 包裝： | 托盤 |
| 配用： | DS80C400-KIT#-ND - EVAL KIT FOR DS80C400 |
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DS80C400 Network Microcontroller
91 of 97
Repeat steps 2, 3 over the message data for which the checksum is to be computed
Read MSB of 16-bit value from OCAD
One’s complement of the byte last read is the Internet checksum MSB
Read LSB of 16-bit value from OCAD
One’s complement of the byte last read is the Internet checksum LSB
Note that the computation of the Internet checksum over the message data and 16-bit checksum field should yield
0000h.
Clock Control and Power Management
The DS80C400 includes a number of unique features that allow flexibility in selecting system clock sources and
operating frequencies. To support the use of inexpensive crystals while allowing full speed operation, a clock
multiplier is included in the microcontroller’s clock circuit. Also, in addition to the standard 80C32 idle and power-
down (stop) modes, the DS80C400 provides a PMM. This mode allows the microcontroller to continue instruction
execution at a very low speed to significantly reduce power consumption (below even idle mode). The DS80C400
also features several enhancements to stop mode that make this extremely low-power mode more useful. Each of
these features is discussed in detail below.
System Clock Control
As mentioned previously, the microcontroller contains special clock-control circuitry that simultaneously provides
maximum timing flexibility and maximum availability and economy in crystal selection. The logical operation of the
system clock divide control function is shown in Figure 20. A 3:1 multiplexer, controlled by CD1, CD0 (PMR.7-6),
selects one of three sources for the internal system clock:
Crystal oscillator or external clock source
(Crystal oscillator or external clock source) divided by 256
(Crystal oscillator or external clock source) frequency multiplied by 2 or 4 times
The system clock control circuitry generates two clock signals that are used by the microcontroller. The internal
system clock provides the time base for timers and internal peripherals. The system clock is run through a divide-
by-4 circuit to generate the machine cycle clock that provides the time base for CPU operations. All instructions
execute in one to five machine cycles. It is important to note the distinction between these two clock signals, as
they are sometimes confused, creating errors in timing calculations.
Setting CTM = 1 and CD1, CD0 = 00b enables the frequency multiplier, either doubling or quadrupling the
frequency of the crystal oscillator or external clock source. The 4X/2X bit controls the multiplying factor, selecting
twice or four times the frequency when set to 0 or 1, respectively. Enabling the frequency multiplier results in
apparent instruction execution speeds of 2 or 1 clocks. Regardless of the configuration of the frequency multiplier,
the system clock of the microcontroller can never be operated faster than 75MHz. This means that the maximum
external clock source is 18.75MHz when using the 4X setting, and 37.5MHz when using the 2X setting.
The primary advantage of the clock multiplier is that it allows the microcontroller to use slower crystals to achieve
the same performance level. This reduces EMI and cost, as slower crystals are generally more available and thus
less expensive.
Setting CD1, CD0 = 11b enables the PMM. When placed into PMM, the incoming crystal or clock frequency is
divided by 256, resulting in a machine cycle of 1024 clocks. Note that power consumption in PMM is less than idle
mode. While both modes leave the power-hungry internal timers running, PMM runs all clocked functions such as
timers at the rate of crystal divided by 1024, rather than crystal divided by 4. Even though instruction execution
continues in PMM (albeit at a reduced speed), it still consumes less power than idle mode. As a result, there is little
reason to use idle mode in new designs.
The system clock and machine cycle rate changes one machine cycle after the instruction changing the control
bits. Note that the change affects all aspects of system operation, including timers and baud rates. Using the
switchback feature, described later, can eliminate many of the problems associated with the PMM.
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相關(guān)代理商/技術(shù)參數(shù) |
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| DS80C400-FNY+ | 功能描述:8位微控制器 -MCU Network MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| DS80C400-KIT | 功能描述:EVAL KIT FOR DS80C400 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:- 產(chǎn)品培訓(xùn)模塊:Blackfin® Processor Core Architecture Overview Blackfin® Device Drivers Blackfin® Optimizations for Performance and Power Consumption Blackfin® System Services 特色產(chǎn)品:Blackfin? BF50x Series Processors 標準包裝:1 系列:Blackfin® 類型:DSP 適用于相關(guān)產(chǎn)品:ADSP-BF548 所含物品:板，軟件，4x4 鍵盤，光學(xué)撥輪，QVGA 觸摸屏 LCD 和 40G 硬盤 配用:ADZS-BFBLUET-EZEXT-ND - EZ-EXTENDER DAUGHTERBOARDADZS-BFLLCD-EZEXT-ND - BOARD EXT LANDSCAP LCD INTERFACE 相關(guān)產(chǎn)品:ADSP-BF542BBCZ-4A-ND - IC DSP 16BIT 400MHZ 400CSBGAADSP-BF544MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542KBCZ-6A-ND - IC DSP 16BIT 600MHZ 400CSBGAADSP-BF547MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF548BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF547BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF544BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF542BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGA |
| DS80C400-KIT# | 功能描述:開發(fā)板和工具包 - 8051 RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓: |
| DS80C410 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontrollers with Ethernet and CAN |
| DS80C410_09 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontrollers with Ethernet and CAN |
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