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參數(shù)資料
| 型號(hào)： | PIC18F87J90-I/PT |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 31/59頁 |
| 文件大小： | 0K |
| 描述： | IC PIC MCU FLASH 128KB 80-TQFP |
| 產(chǎn)品培訓(xùn)模塊： | 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： | I²C，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，LCD，LVD，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 67 |
| 程序存儲(chǔ)器容量： | 128KB（64K x 16） |
| 程序存儲(chǔ)器類型： | 閃存 |
| RAM 容量： | 3.8K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 3.6 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 12x10b |
| 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： | AC162079-ND - HEADER MPLAB ICD2 18F85J90 64/80 AC164323-ND - MODULE SKT FOR 100TQFP |
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2010 Microchip Technology Inc.
DS39933D-page 37
PIC18F87J90 FAMILY
3.3
Clock Sources and
Oscillator Switching
Essentially, PIC18F87J90 family devices have three
independent clock sources:
Primary oscillators
Secondary oscillators
Internal oscillator
The primary oscillators can be thought of as the main
device oscillators. These are any external oscillators
connected to the OSC1 and OSC2 pins, and include
the External Crystal and Resonator modes and the
External Clock modes. If selected by the FOSC<2:0>
Configuration bits, the internal oscillator block (either
the 31 kHz INTRC or the 8 MHz INTOSC source) may
be considered a primary oscillator. The particular mode
is defined by the FOSC Configuration bits. The details
of these modes are covered in Section 3.4 “External
The secondary oscillators are external clock sources
that are not connected to the OSC1 or OSC2 pins.
These sources may continue to operate even after the
controller is placed in a power-managed mode.
PIC18F87J90 family devices offer the Timer1 oscillator
as a secondary oscillator source. This oscillator, in all
power-managed modes, is often the time base for
functions such as a Real-Time Clock (RTC). The
Timer1 oscillator is discussed in greater detail in
In addition to being a primary clock source in some
circumstances, the internal oscillator is available as a
power-managed mode clock source. The INTRC
source is also used as the clock source for several
special features, such as the WDT and Fail-Safe Clock
Monitor. The internal oscillator block is discussed in
more detail in Section 3.5 “Internal Oscillator
The PIC18F87J90 family includes features that allow
the device clock source to be switched from the main
oscillator, chosen by device configuration, to one of the
alternate clock sources. When an alternate clock
source is enabled, various power-managed operating
modes are available.
REGISTER 3-2:
OSCTUNE: OSCILLATOR TUNING REGISTER
R/W-0
INTSRC
PLLEN
TUN5
TUN4
TUN3
TUN2
TUN1
TUN0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
INTSRC: Internal Oscillator Low-Frequency Source Select bit
1
= 31.25 kHz device clock derived from 8 MHz INTOSC source (divide-by-256 enabled)
0
= 31 kHz device clock derived from the INTRC 31 kHz oscillator
bit 6
PLLEN: Frequency Multiplier PLL Enable bit
1
= PLL enabled
0
= PLL disabled
bit 5-0
TUN<5:0>: Fast RC Oscillator (INTOSC) Frequency Tuning bits
011111
= Maximum frequency
000001
000000
= Center frequency. Fast RC oscillator is running at the calibrated frequency.
111111
100000
= Minimum frequency
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| PIC18F87J90T-I/PT | 功能描述:8位微控制器 -MCU Segmnt LCD 128KBFlsh 4KBRAM 12MIPS 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 |
| PIC18F87J93-I/PT | 功能描述:8位微控制器 -MCU 80pn,SEG LCD,4KB RAM 128KB Flsh,12bit ADC 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 |
| PIC18F87J93T-I/PT | 功能描述:8位微控制器 -MCU 80pn,SEG LCD,4KB RAM 128KB Flsh,12bit ADC 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 |
| PIC18F87J94-I/PT | 制造商:Microchip Technology Inc 功能描述:80 PINS, 128KB FLASH, 4KB RAM, 16MIPS, NANOWATT XLP, LCD, US - Trays 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 128KB FLASH 80TQFP 制造商:Microchip Technology Inc 功能描述:80 pins, 128KB Flash, 4KB RAM, 16MIPS, nanoWatt XLP, LCD, USB, 80 TQFP 12x12x1mm |
| PIC18F87J94T-I/PT | 制造商:Microchip Technology Inc 功能描述:80 PINS, 128KB FLASH, 4KB RAM, 16MIPS, NANOWATT XLP, LCD, US - Tape and Reel 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 128KB FLASH 80TQFP 制造商:Microchip Technology Inc 功能描述:8-bit Microcontrollers - MCU 80 pins, 128KB Flash 4KB RAM, 16MIPS |
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