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| 型號(hào)： | AT90USB1287-16AUR |
| 廠(chǎng)商： | Atmel |
| 文件頁(yè)數(shù)： | 34/106頁(yè) |
| 文件大小： | 0K |
| 描述： | IC MCU AVR 128K ISP USB TQFP64 |
| 產(chǎn)品培訓(xùn)模塊： | megaAVR Introduction |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | AVR® 90USB |
| 核心處理器： | AVR |
| 芯體尺寸： | 8-位 |
| 速度： | 16MHz |
| 連通性： | EBI/EMI，I²C，SPI，UART/USART，USB，USB OTG |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 48 |
| 程序存儲(chǔ)器容量： | 128KB（128K x 8） |
| 程序存儲(chǔ)器類(lèi)型： | 閃存 |
| EEPROM 大?。?/td> | 4K x 8 |
| RAM 容量： | 8K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 64-LQFP |
| 包裝： | 帶卷 (TR) |
| 配用： | ATSTK600-ND - DEV KIT FOR AVR/AVR32 ATSTK525-ND - KIT STARTER FOR AT90USB AT90USBKEY2-ND - KIT DEMO FOR AT90USB |
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33
7593L–AVR–09/12
AT90USB64/128
6.5.4
Pull-up and bus-keeper
The pull-ups on the AD7:0 ports may be activated if the corresponding Port register is written to
one. To reduce power consumption in sleep mode, it is recommended to disable the pull-ups by
writing the Port register to zero before entering sleep.
The XMEM interface also provides a bus-keeper on the AD7:0 lines. The bus-keeper can be dis-
abled and enabled in software as described in “XMCRB – External Memory Control Register B”
on page 36. When enabled, the bus-keeper will keep the previous value on the AD7:0 bus while
these lines are tri-stated by the XMEM interface.
6.5.5
Timing
External Memory devices have different timing requirements. To meet these requirements, the
XMEM interface provides four different wait-states as shown in Table 6-5 on page 36. It is impor-
tant to consider the timing specification of the External Memory device before selecting the wait-
state. The most important parameters are the access time for the external memory compared to
the setup requirement. The access time for the External Memory is defined to be the time from
receiving the chip select/address until the data of this address actually is driven on the bus. The
access time cannot exceed the time from the ALE pulse must be asserted low until data is stable
during a read sequence (see t
399 - 401). The different wait-states are set up in software. As an additional feature, it is possible
to divide the external memory space in two sectors with individual wait-state settings. This
makes it possible to connect two different memory devices with different timing requirements to
the same XMEM interface. For XMEM interface timing details, please refer to Tables 31-6
Note that the XMEM interface is asynchronous and that the waveforms in the following figures
are related to the internal system clock. The skew between the internal and external clock
(XTAL1) is not guarantied (varies between devices temperature, and supply voltage). Conse-
quently, the XMEM interface is not suited for synchronous operation.
Figure 6-6.
External data memory cycles without wait-state (SRWn1=0 and SRWn0=0).
ALE
T1
T2
T3
Wr
ite
Re
a
d
WR
T4
A15:8
Address
Prev. addr.
DA7:0
Address
Data
Prev. data
XX
RD
DA7:0 (XMBK = 0)
Data
Prev. data
Address
Data
Prev. data
Address
DA7:0 (XMBK = 1)
System Clock (CLKCPU)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT90USB1287-16ME | 制造商:Atmel Corporation 功能描述: |
| AT90USB1287-16MU | 功能描述:8位微控制器 -MCU 128kB Flash 4kB EEPROM 48 I/O Pins RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| AT90USB1287-64QFN | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:AT90USB1287 (AVR) 64 QFN device (2.7V VCC 5.5V) |
| AT90USB1287-AU | 功能描述:8位微控制器 -MCU AVR USB 128K FLASH 16 MHz,Ind Temp RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| AT90USB1287-AUR | 功能描述:8位微控制器 -MCU USB 128K FLASH 16 MHz RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
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