參數(shù)資料
型號(hào): PIC18F4450-I/PT
廠商: Microchip Technology
文件頁(yè)數(shù): 20/241頁(yè)
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 8KX16 44TQFP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 160
系列: PIC® 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 48MHz
連通性: UART/USART,USB
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,HLVD,POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲(chǔ)器容量: 16KB(8K x 16)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 4.2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 13x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 托盤
產(chǎn)品目錄頁(yè)面: 646 (CN2011-ZH PDF)
配用: DM163025-ND - PIC DEM FULL SPEED USB DEMO BRD
444-1001-ND - DEMO BOARD FOR PICMICRO MCU
AC164020-ND - MODULE SKT PROMATEII 44TQFP
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)當(dāng)前第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)第161頁(yè)第162頁(yè)第163頁(yè)第164頁(yè)第165頁(yè)第166頁(yè)第167頁(yè)第168頁(yè)第169頁(yè)第170頁(yè)第171頁(yè)第172頁(yè)第173頁(yè)第174頁(yè)第175頁(yè)第176頁(yè)第177頁(yè)第178頁(yè)第179頁(yè)第180頁(yè)第181頁(yè)第182頁(yè)第183頁(yè)第184頁(yè)第185頁(yè)第186頁(yè)第187頁(yè)第188頁(yè)第189頁(yè)第190頁(yè)第191頁(yè)第192頁(yè)第193頁(yè)第194頁(yè)第195頁(yè)第196頁(yè)第197頁(yè)第198頁(yè)第199頁(yè)第200頁(yè)第201頁(yè)第202頁(yè)第203頁(yè)第204頁(yè)第205頁(yè)第206頁(yè)第207頁(yè)第208頁(yè)第209頁(yè)第210頁(yè)第211頁(yè)第212頁(yè)第213頁(yè)第214頁(yè)第215頁(yè)第216頁(yè)第217頁(yè)第218頁(yè)第219頁(yè)第220頁(yè)第221頁(yè)第222頁(yè)第223頁(yè)第224頁(yè)第225頁(yè)第226頁(yè)第227頁(yè)第228頁(yè)第229頁(yè)第230頁(yè)第231頁(yè)第232頁(yè)第233頁(yè)第234頁(yè)第235頁(yè)第236頁(yè)第237頁(yè)第238頁(yè)第239頁(yè)第240頁(yè)第241頁(yè)
116
XMEGA A [MANUAL]
8077I–AVR–11/2012
10.3.4 32-bit Real-time Counter
The 32-bit real-time counter (RTC) will count each clock output from the crystal oscillator. It provides a one-millisecond or
one-second resolution, depending on the crystal oscillator clock output selection. For more details on the 32-bit RTC,
10.3.5 Backup Registers
The two backup registers can be used to store volatile data parameters when Vcc is not present.
10.4
Configuration
During device initialization, the battery backup system and RTC must be configured before they can be used. The
recommended configuration sequence is:
1.
Apply a reset
2.
Set the access enable bit
3.
Optionally configure the oscillator output and ESR selection
4.
Optionally enable the crystal oscillator failure monitor and the required delay before continuing configuration
5.
Enable the crystal oscillator
6.
Wait until the crystal oscillator ready flag is set
7.
Configure and enable the RTC
10.5
Operation
The main BOD monitors the main voltage (Vcc) level and controls the power switching. This must always be enabled. In
active and idle modes, the BOD must be in continuos mode. In deep sleep modes, the BOD can be in continuos or
sampled mode. The system is designed as a power backup system for the RTC. Reset sources other than the BOD and
power loss (i.e. external reset, watchdog reset, and software reset) must be treated as a system reset. In this case, the
device state should be treated as unknown and lead to complete re-initialization, including battery backup system
configuration.
10.5.1 Main Power Loss
When Vcc drops below the programmed BOD threshold voltage, the device will:
1.
Switch the battery backup system to be powered from the VBAT pin and enable the BBBOD.
2.
Ignore any input signals to the system to prevent accidental or partial configuration.
3.
Stretch the 1Hz / 1.024kHz clock signal to avoid a clock edge when switching is active.
4.
Reset the part of the device not powered from the VBAT pin.
The battery backup system will continue to run as normal during the power switch and afterwards. When main power is
lost, it is not possible to access or read the status from the registers.
10.5.2 Main Power Restore and Start-up Sequence
At every startup after main power is restored, the software should:
1.
Control the main reset source to determine that a POR or BOD took place.
2.
Check for power on the VBAT pin by reading the BBPWR flag.
3.
Read the power supervisor flags to determine further software action:
If all power supervision flags are cleared, the battery backup system runs as normal. The software should
enable access to the battery backup system and check the crystal oscillator failure flag. If the flag is set, the
software should assume that the RTC counter value is invalid and take appropriate action.
If any power supervision flags are set, it indicates the battery backup system has lost power sometime
during the period when the rest of the device was unpowererd. Software should assume that the
configuration and RTC value are invalid and take appropriate action.
相關(guān)PDF資料
PDF描述
21FMN-BMTTR-A-TB CONN FMN HSNG 21POS STAG REV SMD
PIC16LF87-I/ML IC MCU FLASH 4KX14 EEPROM 28QFN
PIC24HJ32GP204-I/PT IC PIC MCU FLASH 32K 44TQFP
20FMN-BMTTR-A-TB CONN FMN HSNG 20POS STAG REV SMD
PIC16F88-I/SS IC MCU FLASH 4KX14 EEPROM 20SSOP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC18F4450T-I/ML 功能描述:8位微控制器 -MCU 16KB FL 768 RAM 34 I/O FS-USB 2.0 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(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
PIC18F4450T-I/PT 功能描述:8位微控制器 -MCU 16KB FL 768 RAM 34 I/O FS-USB 2.0 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(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
PIC18F4455-BL 制造商:POWERLITE SYSTEMS 功能描述:PIC18F445 W/ BOOTLOADER FOR FLASHLAB 制造商:POWERLITE SYSTEMS 功能描述:PIC18F445 W/ BOOTLOADER, FOR FLASHLAB 制造商:POWERLITE SYSTEMS 功能描述:PIC18F445 W/ BOOTLOADER, FOR FLASHLAB; Silicon Manufacturer:Powerlite Systems; Core Architecture:PIC; Kit Contents:Board; Features:Bootloader Programming, RS232 Connector for Boot-Loading and Serial Comms ;RoHS Compliant: Yes
PIC18F4455-I/ML 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 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(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
PIC18F4455-I/P 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 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(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