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参数资料
型号： PIC18F8720-E/PT
厂商： Microchip Technology
文件页数： 154/165页
文件大小： 0K
描述： IC PIC MCU FLASH 64KX16 80TQFP
产品培训模块： Asynchronous Stimulus
标准包装： 119
系列： PIC® 18F
核心处理器： PIC
芯体尺寸： 8-位
速度： 25MHz
连通性： EBI/EMI，I²C，SPI，UART/USART
外围设备： 欠压检测/复位，LVD，POR，PWM，WDT
输入/输出数： 68
程序存储器容量： 128KB（64K x 16）
程序存储器类型： 闪存
EEPROM 大小： 1K x 8
RAM 容量： 3.75K x 8
电压 - 电源 (Vcc/Vdd)： 4.2 V ~ 5.5 V
数据转换器： A/D 16x10b
振荡器型： 外部
工作温度： -40°C ~ 125°C
封装/外壳： 80-TQFP
包装： 托盘
配用： XLT80PT3-ND - SOCKET TRAN ICE 80MQFP/TQFP
AC164320-ND - MODULE SKT MPLAB PM3 80TQFP
AC174011-ND - MODULE SKT PROMATEII 80TQFP
2004 Microchip Technology Inc.
DS39609B-page 87
PIC18F6520/8520/6620/8620/6720/8720
9.0
INTERRUPTS
The PIC18FXX20 devices have multiple interrupt
sources and an interrupt priority feature that allows
each interrupt source to be assigned a high or a low
priority level. The high priority interrupt vector is at
000008h, while the low priority interrupt vector is at
000018h. High priority interrupt events will override any
low priority interrupts that may be in progress.
There are thirteen registers which are used to control
interrupt operation. They are:
RCON
INTCON
INTCON2
INTCON3
PIR1, PIR2, PIR3
PIE1, PIE2, PIE3
IPR1, IPR2, IPR3
It is recommended that the Microchip header files,
supplied with MPLAB IDE, be used for the symbolic bit
names in these registers. This allows the assembler/
compiler to automatically take care of the placement of
these bits within the specified register.
Each interrupt source has three bits to control its
operation. The functions of these bits are:
Flag bit to indicate that an interrupt event
occurred
Enable bit that allows program execution to
branch to the interrupt vector address when the
flag bit is set
Priority bit to select high priority or low priority
The interrupt priority feature is enabled by setting the
IPEN bit (RCON<7>). When interrupt priority is
enabled, there are two bits which enable interrupts
globally. Setting the GIEH bit (INTCON<7>) enables all
interrupts that have the priority bit set. Setting the GIEL
bit (INTCON<6>) enables all interrupts that have the
priority bit cleared. When the interrupt flag, enable bit
and appropriate global interrupt enable bit are set, the
interrupt will vector immediately to address 000008h or
000018h, depending on the priority level. Individual
interrupts can be disabled through their corresponding
enable bits.
When the IPEN bit is cleared (default state), the
interrupt priority feature is disabled and interrupts are
compatible with PICmicro mid-range devices. In Com-
patibility mode, the interrupt priority bits for each source
have no effect. INTCON<6> is the PEIE bit, which
enables/disables
all peripheral interrupt sources.
INTCON<7> is the GIE bit, which enables/disables all
interrupt sources. All interrupts branch to address
000008h in Compatibility mode.
When an interrupt is responded to, the Global Interrupt
Enable bit is cleared to disable further interrupts. If the
IPEN bit is cleared, this is the GIE bit. If interrupt priority
levels are used, this will be either the GIEH or GIEL bit.
High priority interrupt sources can interrupt a low
priority interrupt.
The return address is pushed onto the stack and the
PC is loaded with the interrupt vector address
(000008h or 000018h). Once in the Interrupt Service
Routine, the source(s) of the interrupt can be deter-
mined by polling the interrupt flag bits. The interrupt
flag bits must be cleared in software before re-enabling
interrupts to avoid recursive interrupts.
The “return from interrupt” instruction, RETFIE, exits
the interrupt routine and sets the GIE bit (GIEH or GIEL
if priority levels are used), which re-enables interrupts.
For external interrupt events, such as the INT pins or
the PORTB input change interrupt, the interrupt latency
will be three to four instruction cycles. The exact
latency is the same for one or two-cycle instructions.
Individual interrupt flag bits are set, regardless of the
status of their corresponding enable bit or the GIE bit.
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相关代理商/技术参数
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PIC18F8720-I/PT 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 18F8720 TQFP80
PIC18F8720-I/PTC01 功能描述:IC PIC MCU FLASH 64KX16 80TQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:PIC® 18F 产品培训模块:XLP Deep Sleep Mode 8-bit PIC® Microcontroller Portfolio 标准包装:22 系列:PIC® XLP™ 18F 核心处理器:PIC 芯体尺寸:8-位 速度:48MHz 连通性:I²C，SPI，UART/USART，USB 外围设备:欠压检测/复位，POR，PWM，WDT 输入/输出数:14 程序存储器容量:8KB（4K x 16） 程序存储器类型:闪存 EEPROM 大小:256 x 8 RAM 容量:512 x 8 电压 - 电源 (Vcc/Vdd):1.8 V ~ 5.5 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:20-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:642 (CN2011-ZH PDF) 配用:DV164126-ND - KIT DEVELOPMENT USB W/PICKIT 2DM164127-ND - KIT DEVELOPMENT USB 18F14/13K50AC164112-ND - VOLTAGE LIMITER MPLAB ICD2 VPP
PIC18F8720T-E/PT 功能描述:8位微控制器 -MCU 25MHz 128KB Flash RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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