參數(shù)資料
型號： PIC18F45J50-I/ML
廠商： Microchip Technology
文件頁數(shù)： 122/164頁
文件大?。?/td> 0K
描述： IC PIC MCU FLASH 32K 2V 44-QFN
產(chǎn)品培訓(xùn)模塊： XLP Deep Sleep Mode
PIC18 J Series MCU Overview
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝： 45
系列： PIC® XLP™ 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 48MHz
連通性： I²C，SPI，UART/USART，USB
外圍設(shè)備： 欠壓檢測/復(fù)位，DMA，POR，PWM，WDT
輸入/輸出數(shù)： 34
程序存儲器容量： 32KB（16K x 16）
程序存儲器類型： 閃存
RAM 容量： 3.8K x 8
電壓 - 電源 (Vcc/Vdd)： 2.15 V ~ 3.6 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-VQFN 裸露焊盤
包裝： 管件
產(chǎn)品目錄頁面： 657 (CN2011-ZH PDF)
配用： AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
PIC18F46J50 FAMILY
DS39931D-page 60
2011 Microchip Technology Inc.
4.7
Ultra Low-Power Wake-up
The Ultra Low-Power Wake-up (ULPWU) on RA0 allows
a slow falling voltage to generate an interrupt-on-change
without excess current consumption.
Follow these steps to use this feature:
1.
Configure a remappable output pin to output the
ULPOUT signal.
2.
Map an INTx interrupt-on-change input function to
the same pin as used for the ULPOUT output func-
tion. Alternatively, in Step 1, configure ULPOUT to
output onto a PORTB interrupt-on-change pin.
3.
Charge the capacitor on RA0 by configuring the
RA0 pin to an output and setting it to ‘1’.
4.
Enable interrupt-on-change (PIE bit) for the
corresponding pin selected in Step 2.
5.
Stop charging the capacitor by configuring RA0
as an input.
6.
Discharge the capacitor by setting the ULPEN
and ULPSINK bits in the WDTCON register.
7.
Configure Sleep mode.
8.
Enter Sleep mode.
When the voltage on RA0 drops below VIL, an interrupt
will be generated, which will cause the device to
wake-up and execute the next instruction.
This feature provides a low-power technique for
periodically waking up the device from Sleep mode.
The time-out is dependent on the discharge time of the
RC circuit on RA0.
When the ULPWU module causes the device to
wake-up from Sleep mode, the WDTCON<ULPLVL>
bit is set. When the ULPWU module causes the device
to
wake-up
from
Deep
Sleep,
the
DSULP
(DSWAKEL<5>) bit is set. Software can check these
bits upon wake-up to determine the wake-up source.
Also in Sleep mode, only the remappable output func-
tion, ULPWU, will output this bit value to an RPn pin for
externally detecting wake-up events.
See Example 4-1 for initializing the ULPWU module.
A series resistor between RA0 and the external
capacitor provides overcurrent protection for the
RA0/AN0/C1INA/ULPWU/RP0 pin and can allow for
software calibration of the time-out (see Figure 4-9).
FIGURE 4-9:
SERIAL RESISTOR
A timer can be used to measure the charge time and
discharge time of the capacitor. The charge time can
then be adjusted to provide the desired interrupt delay.
This technique will compensate for the affects of
temperature, voltage and component accuracy. The
ULPWU peripheral can also be configured as a simple
Programmable
Low-Voltage
Detect
(LVD)
or
temperature sensor.
Note:
For module-related bit definitions, see the
WDTCON
register
in
and the
DSWAKEL register (Register 4-6).
Note:
For more information, refer to AN879,
“Using the Microchip Ultra Low-Power
Wake-up
Module
”
application
note
(DS00879).
R1
C1
RA0
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PIC18F45K20-E/MV 功能描述:8位微控制器 -MCU 32KB FL 1536b RAM 8b Familynanowatt XLP 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
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