- 您現(xiàn)在的位置：買賣IC網 > PDF目錄3872 > PIC18F25K22-I/SS (Microchip Technology)MCU 8BIT 32KB FLASH 5.5V 28SSOP PDF資料下載
參數(shù)資料
| 型號： | PIC18F25K22-I/SS |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 59/71頁 |
| 文件大?。?/td> | 0K |
| 描述： | MCU 8BIT 32KB FLASH 5.5V 28SSOP |
| 產品培訓模塊： | 8-bit PIC® Microcontroller Portfolio |
| 標準包裝： | 47 |
| 系列： | PIC® XLP™ 18F |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 64MHz |
| 連通性： | I²C，SPI，UART/USART |
| 外圍設備： | 欠壓檢測/復位，HLVD，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 24 |
| 程序存儲器容量： | 32KB（16K x 16） |
| 程序存儲器類型： | 閃存 |
| EEPROM 大?。?/td> | 256 x 8 |
| RAM 容量： | 1.5K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.8 V ~ 5.5 V |
| 數(shù)據(jù)轉換器： | A/D 19x10b |
| 振蕩器型： | 內部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 包裝： | 管件 |
| 產品目錄頁面： | 656 (CN2011-ZH PDF) |
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頁當前第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頁第69頁第70頁第71頁
PIC18(L)F2X/4XK22
DS41412F-page 62
2010-2012 Microchip Technology Inc.
4.5
Brown-out Reset (BOR)
PIC18(L)F2X/4XK22 devices implement a BOR circuit
that provides the user with a number of configuration and
power-saving options. The BOR is controlled by the
BORV<1:0> and BOREN<1:0> bits of the CONFIG2L
Configuration register. There are a total of four BOR
configurations which are summarized in Table 4-1.
The BOR threshold is set by the BORV<1:0> bits. If
BOR is enabled (any values of BOREN<1:0>, except
‘00’), any drop of VDD below VBOR for greater than
TBOR will reset the device. A Reset may or may not
occur if VDD falls below VBOR for less than TBOR. The
chip will remain in Brown-out Reset until VDD rises
above VBOR.
If the Power-up Timer is enabled, it will be invoked after
VDD rises above VBOR; it then will keep the chip in
Reset for an additional time delay, TPWRT. If VDD drops
below VBOR while the Power-up Timer is running, the
chip will go back into a Brown-out Reset and the
Power-up Timer will be initialized. Once VDD rises
above VBOR, the Power-up Timer will execute the
additional time delay.
BOR
and
the
Power-on
Timer
(PWRT)
are
independently configured. Enabling BOR Reset does
not automatically enable the PWRT.
The BOR circuit has an output that feeds into the POR
circuit and rearms the POR within the operating range
of the BOR. This early rearming of the POR ensures
that the device will remain in Reset in the event that VDD
falls below the operating range of the BOR circuitry.
4.5.1
DETECTING BOR
When BOR is enabled, the BOR bit always resets to ‘0’
on any BOR or POR event. This makes it difficult to
determine if a BOR event has occurred just by reading
the state of BOR alone. A more reliable method is to
simultaneously check the state of both POR and BOR.
This assumes that the POR and BOR bits are reset to
‘1’ by software immediately after any POR event. If
BOR is ‘0’ while POR is ‘1’, it can be reliably assumed
that a BOR event has occurred.
4.5.2
SOFTWARE ENABLED BOR
When BOREN<1:0> = 01, the BOR can be enabled or
disabled by the user in software. This is done with the
SBOREN control bit of the RCON register. Setting
SBOREN enables the BOR to function as previously
described. Clearing SBOREN disables the BOR
entirely. The SBOREN bit operates only in this mode;
otherwise it is read as ‘0’.
Placing the BOR under software control gives the user
the additional flexibility of tailoring the application to the
environment without having to reprogram the device to
change BOR configuration. It also allows the user to
tailor device power consumption in software by
eliminating the incremental current that the BOR
consumes. While the BOR current is typically very small,
it may have some impact in low-power applications.
4.5.3
DISABLING BOR IN SLEEP MODE
When BOREN<1:0> = 10, the BOR remains under
hardware
control
and
operates
as
previously
described. Whenever the device enters Sleep mode,
however, the BOR is automatically disabled. When the
device returns to any other operating mode, BOR is
automatically re-enabled.
This mode allows for applications to recover from
brown-out situations, while actively executing code,
when the device requires BOR protection the most. At
the same time, it saves additional power in Sleep mode
by eliminating the small incremental BOR current.
4.5.4
MINIMUM BOR ENABLE TIME
Enabling the BOR also enables the Fixed Voltage
Reference (FVR) when no other peripheral requiring the
FVR is active. The BOR becomes active only after the
FVR stabilizes. Therefore, to ensure BOR protection,
the FVR settling time must be considered when
enabling the BOR in software or when the BOR is
automatically enabled after waking from Sleep. If the
BOR is disabled, in software or by reentering Sleep
before the FVR stabilizes, the BOR circuit will not sense
a BOR condition. The FVRST bit of the VREFCON0
register can be used to determine FVR stability.
Note:
Even when BOR is under software
control, the BOR Reset voltage level is still
set by the BORV<1:0> Configuration bits.
It cannot be changed by software.
相關PDF資料 |
PDF描述 |
|---|---|
| PIC18LF25K22-I/SS | MCU 8BIT 32KB FLASH 3.6V 28SSOP |
| PIC16F887-I/PT | IC PIC MCU FLASH 8KX14 44TQFP |
| PIC16F727-I/P | IC PIC MCU FLASH 8KX14 40DIP |
| PIC18F96J65T-I/PT | IC PIC MCU FLASH 48KX16 100TQFP |
| PIC18F86J65T-I/PT | IC PIC MCU FLASH 48KX16 80TQFP |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PIC18F25K22T-I/ML | 功能描述:8位微控制器 -MCU 32KB Flash 1536B RAM 8B nanoWatt 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 安裝風格:SMD/SMT |
| PIC18F25K22T-I/SO | 功能描述:8位微控制器 -MCU 32KB Flash 1536B RAM 8B nanoWatt 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 安裝風格:SMD/SMT |
| PIC18F25K22T-I/SS | 功能描述:8位微控制器 -MCU 32KB Flash 1536B RAM 8B nanoWatt 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 安裝風格:SMD/SMT |
| PIC18F25K50-E/ML | 制造商:Microchip Technology Inc 功能描述:32 KB FLASH, 2048 BYTES RAM, 4 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 32KB FLASH 28QFN |
| PIC18F25K50-E/SO | 制造商:Microchip Technology Inc 功能描述:32 KB FLASH, 2048 BYTES RAM, 48 MHZ INT. OSC, 25 I/0, PIC18 - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 32KB FLASH 28SOIC |
發(fā)布緊急采購，3分鐘左右您將得到回復。