参数资料
型号: PIC18F67J10T-I/PT
厂商: Microchip Technology
文件页数: 26/44页
文件大小: 0K
描述: IC PIC MCU FLASH 64KX16 64TQFP
产品培训模块: Asynchronous Stimulus
PIC18 J Series MCU Overview
标准包装: 1
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 40MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 50
程序存储器容量: 128KB(64K x 16)
程序存储器类型: 闪存
RAM 容量: 3.8K x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 3.6 V
数据转换器: A/D 11x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-TQFP
包装: 剪切带 (CT)
配用: MA180015-ND - MODULE PLUG-IN 18F87J10 FOR HPC
AC162062-ND - HEADER INTRFC MPLAB ICD2 64/80P
AC164327-ND - MODULE SKT FOR 64TQFP
其它名称: PIC18F67J10T-I/PTCT
PIC18F87J10 FAMILY
DS39663F-page 30
2009 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
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
circuit 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. A suggested
layout is shown in Figure 2-4.
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”
FIGURE 2-4:
SUGGESTED PLACEMENT
OF THE OSCILLATOR
CIRCUIT
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.
13
Main Oscillator
Guard Ring
Guard Trace
Secondary
Oscillator
14
15
16
17
18
19
20
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