參數(shù)資料
型號: AT90CAN64-15AZ
廠商: Atmel
文件頁數(shù): 69/185頁
文件大小: 0K
描述: MCU AVR 64K FLASH 15MHZ 64TQFP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 1,000
系列: AVR® 90CAN
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: CAN,I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 53
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 4K 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 ~ 125°C
封裝/外殼: 64-TQFP
包裝: 帶卷 (TR)
配用: ATSTK600-ND - DEV KIT FOR AVR/AVR32
ATDVK90CAN1-ND - KIT DEV FOR AT90CAN128 MCU
其它名稱: AT90CAN64-15AZ-ND
AT90CAN64-15AZTR
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁當(dāng)前第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁
160
7682C–AUTO–04/08
AT90CAN32/64/128
14.10.2
Asynchronous Operation of Timer/Counter2
When Timer/Counter2 operates asynchronously, some considerations must be taken.
Warning: When switching between asynchronous and synchronous clocking of
Timer/Counter2, the timer registers TCNT2, OCR2A, and TCCR2A might be corrupted. A
safe procedure for switching clock source is:
a.
Disable the Timer/Counter2 interrupts by clearing OCIE2A and TOIE2.
b.
Select clock source by setting AS2 and EXCLK as appropriate.
c.
Write new values to TCNT2, OCR2A, and TCCR2A.
d.
To switch to asynchronous operation: Wait for TCN2UB, OCR2UB, and TCR2UB.
e.
Clear the Timer/Counter2 interrupt flags.
f.
Enable interrupts, if needed.
The Oscillator is optimized for use with a 32.768 kHz watch crystal. The CPU main clock
frequency must be more than four times the Oscillator or external clock frequency.
When writing to one of the registers TCNT2, OCR2A, or TCCR2A, the value is transferred to
a temporary register, and latched after two positive edges on TOSC1. The user should not
write a new value before the contents of the temporary register have been transferred to its
destination. Each of the three mentioned registers have their individual temporary register,
which means that e.g. writing to TCNT2 does not disturb an OCR2A write in progress. To
detect that a transfer to the destination register has taken place, the Asynchronous Status
Register – ASSR has been implemented.
When entering Power-save or Extended Standby mode after having written to TCNT2,
OCR2A, or TCCR2A, the user must wait until the written register has been updated if
Timer/Counter2 is used to wake up the device. Otherwise, the MCU will enter sleep mode
before the changes are effective. This is particularly important if the Output Compare2
interrupt is used to wake up the device, since the Output Compare function is disabled during
writing to OCR2A or TCNT2. If the write cycle is not finished, and the MCU enters sleep
mode before the OCR2UB bit returns to zero, the device will never receive a compare match
interrupt, and the MCU will not wake up.
If Timer/Counter2 is used to wake the device up from Power-save or Extended Standby
mode, precautions must be taken if the user wants to re-enter one of these modes: The
interrupt logic needs one TOSC1 cycle to be reset. If the time between wake-up and re-
entering sleep mode is less than one TOSC1 cycle, the interrupt will not occur, and the
device will fail to wake up. If the user is in doubt whether the time before re-entering Power-
save mode is sufficient, the following algorithm can be used to ensure that one TOSC1 cycle
has elapsed:
a.
Write a value to TCCR2A, TCNT2, or OCR2A.
b.
Wait until the corresponding Update Busy flag in ASSR returns to zero.
c.
Enter Power-save or ADC Noise Reduction mode.
When the asynchronous operation is selected, the 32.768 kHz Oscillator for Timer/Counter2
is always running, except in Power-down and Standby modes. After a Power-up Reset or
wake-up from Power-down or Standby mode, the user should be aware of the fact that this
Oscillator might take as long as one second to stabilize. The user is advised to wait for at
least one second before using Timer/Counter2 after power-up or wake-up from Power-down
or Standby mode. The contents of all Timer/Counter2 Registers must be considered lost after
a wake-up from Power-down or Standby mode due to unstable clock signal upon start-up, no
matter whether the Oscillator is in use or a clock signal is applied to the TOSC1 pin.
相關(guān)PDF資料
PDF描述
AT90CAN64-15MZ MCU AVR 64K FLASH 15MHZ 64-QFN
AT32UC3A0256-ALUR IC MCU AVR32 256K FLASH 144LQFP
DS80C390-FCR+ IC MPU CAN DUAL HS 64-LQFP
VI-BTH-IW-F2 CONVERTER MOD DC/DC 52V 100W
VI-BTH-IW-F1 CONVERTER MOD DC/DC 52V 100W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT90CAN64-15MT 功能描述:8位微控制器 -MCU 64KB Flash 15MHz 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
AT90CAN64-15MT1 功能描述:8位微控制器 -MCU 64KB Flash 15MHz 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
AT90CAN64-15MZ 功能描述:8位微控制器 -MCU 64KB Flash 15MHz 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
AT90CAN64-16AI 功能描述:8位微控制器 -MCU Microcontroller 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
AT90CAN64-16AU 功能描述:8位微控制器 -MCU CAN AVR UC 64K FLASH SAMPLE 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