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| 型號(hào)： | PIC18F65K90-I/MR |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 285/338頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 8BIT 32KB FLASH 64QFN |
| 產(chǎn)品培訓(xùn)模塊： | 8-bit PIC® Microcontroller Portfolio |
| 標(biāo)準(zhǔn)包裝： | 40 |
| 系列： | PIC® XLP™ 18F |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 64MHz |
| 連通性： | I²C，LIN，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，LCD，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 53 |
| 程序存儲(chǔ)器容量： | 32KB（16K x 16） |
| 程序存儲(chǔ)器類型： | 閃存 |
| EEPROM 大?。?/td> | 1K x 8 |
| RAM 容量： | 2K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.8 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 16x12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 64-VFQFN 裸露焊盤 |
| 包裝： | 管件 |
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PIC18F87K90 FAMILY
DS39957D-page 50
2009-2011 Microchip Technology Inc.
3.6.2
INTPLL MODES
The 4x Phase Locked Loop (PLL) can be used with the
HF-INTOSC to produce faster device clock speeds
than are normally possible with the internal oscillator
sources. When enabled, the PLL produces a clock
speed of 32 MHz or 64 MHz.
PLL operation is controlled through software. The con-
trol bit, PLLEN (OSCTUNE<6>) is used to enable or
disable its operation. Additionally, the PLL will only func-
tion when the selected HF-INTOSC frequency is either
8 MHz or 16 MHz (OSCCON<6:4> = 111 or 110).
Like the INTIO modes, there are two distinct INTPLL
modes available:
In INTPLL1 mode, the OSC2 pin outputs FOSC/4,
while OSC1 functions as RA7 for digital input and
output. Externally, this is identical in appearance
to INTIO1 (Figure 3-8).
In INTPLL2 mode, OSC1 functions as RA7 and
OSC2 functions as RA6, both for digital input and
output. Externally, this is identical to INTIO2
3.6.3
INTERNAL OSCILLATOR OUTPUT
FREQUENCY AND TUNING
The internal oscillator block is calibrated at the factory
to produce an INTOSC output frequency of 16 MHz. It
can be adjusted in the user’s application by writing to
TUN<5:0> (OSCTUNE<5:0>) in the OSCTUNE
register (Register 3-3).
When the OSCTUNE register is modified, the INTOSC
(HF-INTOSC and MF-INTOSC) frequency will begin
shifting to the new frequency. The oscillator will require
some time to stabilize. Code execution continues
during this shift and there is no indication that the shift
has occurred.
The LF-INTOSC oscillator operates independently of
the HF-INTOSC or the MF-INTOSC source. Any
changes in the HF-INTOSC or the MF-INTOSC source,
across voltage and temperature, are not necessarily
reflected by changes in LF-INTOSC or vice versa. The
frequency of LF-INTOSC is not affected by OSCTUNE.
3.6.4
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
register. Depending on the device, this may have no
effect on the LF-INTOSC 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.
3.6.4.1
Compensating with the EUSART
An adjustment may be required when the EUSART
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.
3.6.4.2
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 SOSC
oscillator.
Both timers are cleared, but the timer clocked by the
reference source generates interrupts. When an inter-
rupt 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.
3.6.4.3
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.
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| PIC18F65K90T-I/MR | 功能描述:8位微控制器 -MCU 32kB Flash 2kB RAM LCD 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 |
| PIC18F65K90T-I/MRRSL | 功能描述:8位微控制器 -MCU 32KB Flash 2KB RAM nanoWatt XLP LCD 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 |
| PIC18F65K90T-I/PT | 功能描述:8位微控制器 -MCU 32kB Flash 2kB RAM LCD 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 |
| PIC18F65K90T-I/PTRSL | 功能描述:8位微控制器 -MCU 32KB Flash 2KB RAM nanoWatt XLP LCD 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 |
| PIC18F6620-E/PT | 功能描述:8位微控制器 -MCU 64KB 3840 RAM 52I/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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