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參數資料
| 型號： | PIC18F87J90-I/PT |
| 廠商： | Microchip Technology |
| 文件頁數： | 28/59頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PIC MCU FLASH 128KB 80-TQFP |
| 產品培訓模塊： | PIC18 J Series MCU Overview 8-bit PIC® Microcontroller Portfolio |
| 標準包裝： | 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 |
| 外圍設備： | 欠壓檢測/復位，LCD，LVD，POR，PWM，WDT |
| 輸入/輸出數： | 67 |
| 程序存儲器容量： | 128KB（64K 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 V ~ 3.6 V |
| 數據轉換器： | A/D 12x10b |
| 振蕩器型： | 內部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 80-TQFP |
| 包裝： | 托盤 |
| 產品目錄頁面： | 644 (CN2011-ZH PDF) |
| 配用： | AC162079-ND - HEADER MPLAB ICD2 18F85J90 64/80 AC164323-ND - MODULE SKT FOR 100TQFP |
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PIC18F87J90 FAMILY
DS39933D-page 34
2010 Microchip Technology Inc.
2.6
External Oscillator Pins
Many microcontrollers have options for at least two
oscillators: a high-frequency primary oscillator and a
low-frequency
secondary
oscillator
(refer
to
Section 3.0 “Oscillator Configurations” for details).
The oscillator circuit should be placed on the same
side of the board as the device. Place the oscillator
circuit close to the respective oscillator pins with no
more than 0.5 inch (12 mm) between the circuit
components and the pins. The load capacitors should
be placed next to the oscillator itself, on the same side
of the board.
Use a grounded copper pour around the oscillator cir-
cuit to isolate it from surrounding circuits. The
grounded copper pour should be routed directly to the
MCU ground. Do not run any signal traces or power
traces inside the ground pour. Also, if using a two-sided
board, avoid any traces on the other side of the board
where the crystal is placed.
Layout suggestions are shown in Figure 2-4. In-line
packages may be handled with a single-sided layout
that completely encompasses the oscillator pins. With
fine-pitch packages, it is not always possible to com-
pletely surround the pins and components. A suitable
solution is to tie the broken guard sections to a mirrored
ground layer. In all cases, the guard trace(s) must be
returned to ground.
In planning the application’s routing and I/O assign-
ments, ensure that adjacent port pins and other signals
in close proximity to the oscillator are benign (i.e., free
of high frequencies, short rise and fall times, and other
similar noise).
For additional information and design guidance on
oscillator circuits, please refer to these Microchip
Application Notes, available at the corporate web site
(www.microchip.com):
AN826, “Crystal Oscillator Basics and Crystal
Selection for rfPIC and PICmicro Devices”
AN849, “Basic PICmicro Oscillator Design”
AN943, “Practical PICmicro Oscillator Analysis
and Design”
AN949, “Making Your Oscillator Work”
2.7
Unused I/Os
Unused I/O pins should be configured as outputs and
driven to a logic low state. Alternatively, connect a 1 k
to 10 k resistor to VSS on unused pins and drive the
output to logic low.
FIGURE 2-4:
SUGGESTED PLACEMENT
OF THE OSCILLATOR
CIRCUIT
GND
`
OSC1
OSC2
T1OSO
T1OS I
Copper Pour
Primary Oscillator
Crystal
Timer1 Oscillator
Crystal
DEVICE PINS
Primary
Oscillator
C1
C2
T1 Oscillator: C1
T1 Oscillator: C2
(tied to ground)
Single-Sided and In-Line Layouts:
Fine-Pitch (Dual-Sided) Layouts:
GND
OSCO
OSCI
Bottom Layer
Copper Pour
Oscillator
Crystal
Top Layer Copper Pour
C2
C1
DEVICE PINS
(tied to ground)
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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 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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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