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| 型號： | PIC24FJ128GA008-I/PT |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 82/258頁 |
| 文件大小： | 0K |
| 描述： | IC PIC MCU FLASH 128K 80TQFP |
| 產(chǎn)品培訓(xùn)模塊： | PIC24 Introduction Graphics LCD System and PIC24 Interface Asynchronous Stimulus |
| 特色產(chǎn)品： | PIC24FJ/33FJ MCUs & dsPIC? DSCs |
| 標(biāo)準(zhǔn)包裝： | 119 |
| 系列： | PIC® 24F |
| 核心處理器： | PIC |
| 芯體尺寸： | 16-位 |
| 速度： | 16MHz |
| 連通性： | I²C，PMP，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 69 |
| 程序存儲器容量： | 128KB（43K x 24） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 8K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 3.6 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 16x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 80-TQFP |
| 包裝： | 托盤 |
| 產(chǎn)品目錄頁面： | 648 (CN2011-ZH PDF) |
| 配用： | 876-1004-ND - PIC24 BREAKOUT BOARD DM240011-ND - KIT STARTER MPLAB FOR PIC24F MCU MA160011-ND - DAUGHTER BOARD PICDEM LCD 16F91X DM240001-ND - BOARD DEMO PIC24/DSPIC33/PIC32 AC164328-ND - MODULE SKT FOR 80TQFP |
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PIC24FJ128GA010 FAMILY
DS39747F-page 172
2005-2012 Microchip Technology Inc.
19.2
Calibration
The real-time crystal input can be calibrated using the
periodic auto-adjust feature. When properly calibrated,
the RTCC can provide an error of less than 3 seconds
per month. This is accomplished by finding the number
of error clock pulses and storing the value into the
lower half of the RCFGCAL register. The 8-bit signed
value loaded into the lower half of RCFGCAL is multi-
plied by four and will either be added or subtracted from
the RTCC timer, once every minute. Refer to the steps
below for RTCC calibration:
1.
Using another timer resource on the device, the
user must find the error of the 32.768 kHz
crystal.
2.
Once the error is known, it must be converted to
the number of error clock pulses per minute.
EQUATION 19-1:
3.
a) If the oscillator is faster then ideal (negative
result form Step 2), the RCFGCAL register value
needs to be negative. This causes the specified
number of clock pulses to be subtracted from
the timer counter, once every minute.
b) If the oscillator is slower then ideal (positive
result from Step 2), the RCFGCAL register value
needs to be positive. This causes the specified
number of clock pulses to be subtracted from
the timer counter, once every minute.
4.
Divide the number of error clocks per minute by
4 to get the correct CAL value and load the
RCFGCAL register with the correct value. (Each
1-bit increment in CAL adds or subtracts
4 pulses). Load the RCFGCAL register with the
correct value.
Writes to the lower half of the RCFGCAL register
should only occur when the timer is turned off or
immediately after the rising edge of the seconds pulse.
19.3
Alarm
Configurable from half second to one year
Enabled using the ALRMEN bit
(ALCFGRPT<15>, Register 19-3)
One-time alarm and repeat alarm options are
available
19.3.1
CONFIGURING THE ALARM
The alarm feature is enabled using the ALRMEN bit.
This bit is cleared when an alarm is issued. Writes to
ALRMVALH:ALRMVALL should only take place when
ALRMEN = 0.
As shown in Figure 19-2, the interval selection of the
alarm is configured through the AMASK bits
(ALCFGRPT<13:10>). These bits determine which and
how many digits of the alarm must match the clock value
for the alarm to occur. The alarm can also be configured
to repeat, based on a preconfigured interval. The
amount of times this occurs, once the alarm is enabled,
is stored in the lower half of the ALCFGRPT register.
When
ALCFGRPT
=
00
and
the
CHIME
(ALCFGRPT<14>) bit = 0, the repeat function is
disabled and only a single alarm will occur. The alarm
can be repeated up to 255 times by loading the lower
half of the ALCFGRPT register with FFh.
After each alarm is issued, the ALCFGRPT register is
decremented by one. Once the register has reached
‘00’, the alarm will be issued one last time, after which,
the ALRMEN bit will be cleared automatically and the
alarm will turn off. Indefinite repetition of the alarm can
occur if the CHIME bit = 1. Instead of the alarm being
disabled when the ALCFGRPT register reaches ‘00’, it
will roll over to FF and continue counting indefinitely
when CHIME = 1.
19.3.2
ALARM INTERRUPT
At every alarm event an interrupt is generated. In addi-
tion, an alarm pulse output is provided that operates at
half the frequency of the alarm. This output is
completely synchronous to the RTCC clock and can be
used as a trigger clock to other peripherals.
Note:
It is up to the user to include in the error
value, the initial error of the crystal drift
due to temperature and drift due to crystal
aging.
(Ideal Frequency – Measured Frequency) * 60 = Clocks per Minute
Ideal Frequency = 32,768 Hz
Note:
Changing any of the registers, other then
the RCFGCAL and ALCFGRPT registers,
and the CHIME bit while the alarm is
enabled (ALRMEN = 1), can result in a
false alarm event leading to a false alarm
interrupt. To avoid a false alarm event, the
timer and alarm values should only be
changed while the alarm is disabled
(ALRMEN = 0). It is recommended that
the ALCFGRPT register and CHIME bit be
changed when RTCSYNC = 0.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC24FJ128GA008T-I/PF | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:64/80/100-Pin General Purpose, 16-Bit Flash Microcontrollers |
| PIC24FJ128GA008T-I/PT | 功能描述:16位微控制器 - MCU 128KB 69I/O RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
| PIC24FJ128GA010 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:General Purpose, 16-Bit Flash Microcontrollers |
| PIC24FJ128GA010_09 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:64/80/100-Pin General Purpose, 16-Bit Flash Microcontrollers |
| PIC24FJ128GA010_12 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:64/80/100-Pin, General Purpose, 16-Bit Flash Microcontrollers |
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