參數(shù)資料
型號(hào)： PIC18F86J11-I/PT
廠商： Microchip Technology
文件頁數(shù)： 47/107頁
文件大小： 0K
描述： IC PIC MCU FLASH 32KX16 80TQFP
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
PIC18 J Series MCU Overview
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝： 119
系列： PIC® 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 48MHz
連通性： EBI/EMI，I²C，SPI，UART/USART
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，LVD，POR，PWM，WDT
輸入/輸出數(shù)： 68
程序存儲(chǔ)器容量： 64KB（32K x 16）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 3930 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 15x10b
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： 644 (CN2011-ZH PDF)
配用： AC162091-ND - HEADER MPLAB ICD2 18F87J11 64/80
MA180020-ND - MODULE PLUG-IN HPC EXPL 18F87J11
AC164328-ND - MODULE SKT FOR 80TQFP
PIC18F87J11 FAMILY
DS39778E-page 44
2007-2012 Microchip Technology Inc.
3.5.3
INTERNAL OSCILLATOR OUTPUT
FREQUENCY AND TUNING
The internal oscillator block is calibrated at the factory
to produce an INTOSC output frequency of 8 MHz. It
can be adjusted in the user’s application by writing to
TUN<5:0> (OSCTUNE<5:0>) in the OSCTUNE
register (Register 3-2).
When the OSCTUNE register is modified, the INTOSC
frequency will begin shifting to the new frequency. The
oscillator will stabilize within 1 ms. Code execution
continues during this shift and there is no indication that
the shift has occurred.
The INTRC oscillator operates independently of the
INTOSC source. Any changes in INTOSC across
voltage and temperature are not necessarily reflected
by changes in INTRC or vice versa. The frequency of
INTRC is not affected by OSCTUNE.
3.5.4
INTOSC FREQUENCY DRIFT
The INTOSC frequency may drift as VDD or tempera-
ture changes, and can affect the controller operation in
a variety of ways. It is possible to adjust the INTOSC
frequency by modifying the value in the OSCTUNE reg-
ister. Depending on the device, this may have no effect
on the INTRC clock source frequency.
Tuning INTOSC requires knowing when to make the
adjustment, in which direction it should be made, and in
some cases, how large a change is needed. Three
compensation techniques are shown here.
3.5.4.1
Compensating with the EUSARTx
An adjustment may be required when the EUSARTx
begins to generate Framing Errors or receives data
with errors while in Asynchronous mode. Framing
Errors indicate that the device clock frequency is too
high. To adjust for this, decrement the value in
OSCTUNE to reduce the clock frequency. On the other
hand, errors in data may suggest that the clock speed
is too low. To compensate, increment OSCTUNE to
increase the clock frequency.
3.5.4.2
Compensating with the Timers
This technique compares device clock speed to some
reference clock. Two timers may be used; one timer is
clocked by the peripheral clock, while the other is
clocked by a fixed reference source, such as the
Timer1 oscillator.
Both timers are cleared, but the timer clocked by the
reference generates interrupts. When an interrupt
occurs, the internally clocked timer is read and both
timers are cleared. If the internally clocked timer value
is much greater than expected, then the internal
oscillator block is running too fast. To adjust for this,
decrement the OSCTUNE register.
3.5.4.3
Compensating with the CCP Module
in Capture Mode
A CCP module can use free-running Timer1 (or
Timer3), clocked by the internal oscillator block and an
external event with a known period (i.e., AC power
frequency). The time of the first event is captured in the
CCPRxH:CCPRxL registers and is recorded for use
later. When the second event causes a capture, the
time of the first event is subtracted from the time of the
second event. Since the period of the external event is
known, the time difference between events can be
calculated.
If the measured time is much greater than the
calculated time, the internal oscillator block is running
too fast. To compensate, decrement the OSCTUNE
register. If the measured time is much less than the
calculated time, the internal oscillator block is running
too slow. To compensate, increment the OSCTUNE
register.
3.6
Reference Clock Output
In addition to the FOSC/4 clock output in certain oscilla-
tor modes, the device clock in the PIC18F87J11 family
can also be configured to provide a reference clock out-
put signal to a port pin. This feature is available in all
oscillator configurations and allows the user to select a
greater range of clock sub-multiples to drive external
devices in the application.
This reference clock output is controlled by the
REFOCON register (Register 3-3). Setting the ROON
bit (REFOCON<7>) makes the clock signal available
on the REFO (RE3) pin. The RODIV<3:0> bits enable
the selection of 16 different clock divider options.
The ROSSLP and ROSEL bits (REFOCON<5:4>) con-
trol the availability of the reference output during Sleep
mode. The ROSEL bit determines if the oscillator on
OSC1 and OSC2, or the current system clock source,
is used for the reference clock output. The ROSSLP bit
determines if the reference source is available on RE3
when the device is in Sleep mode.
To use the reference clock output in Sleep mode, both
the ROSSLP and ROSEL bits must be set. The device
clock must also be configured for an EC or HS mode;
otherwise, the oscillator on OSC1 and OSC2 will be
powered down when the device enters Sleep mode.
Clearing the ROSEL bit allows the reference output
frequency to change as the system clock changes
during any clock switches.
The REFOCON register is an alternate SFR and
shares the same memory address as the OSCCON
register. It is accessed by setting the ADSHR bit in the
WDTCON register (WDTCON<4>).
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PIC18F86J11T-I/PT 功能描述:8位微控制器 -MCU 64KB Flash 3936bytes RAM 67 I/O 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
PIC18F86J15-I/PT 功能描述:8位微控制器 -MCU 96 KB FL 4 KB RAM 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
PIC18F86J15T-I/PT 功能描述:8位微控制器 -MCU 96 KB FL 4 KB RAM 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
PIC18F86J16-I/PT 功能描述:8位微控制器 -MCU 96KB FL 3936b RAM 10 MIPS 67 I/O 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
PIC18F86J16T-I/PT 功能描述:8位微控制器 -MCU 96KB Flash 3936bytes RAM 67 I/O 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
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