参数资料
型号: MC68711E20CFNE2
厂商: Freescale Semiconductor
文件页数: 81/138页
文件大小: 0K
描述: IC MCU 8BIT 20K FLASH 52-PLCC
标准包装: 23
系列: HC11
核心处理器: HC11
芯体尺寸: 8-位
速度: 2MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 38
程序存储器容量: 20KB(20K x 8)
程序存储器类型: OTP
EEPROM 大小: 512 x 8
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
数据转换器: A/D 8x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 52-LCC(J 形引线)
包装: 管件
产品目录页面: 723 (CN2011-ZH PDF)
MC68HC711D3 Data Sheet, Rev. 2.1
Freescale Semiconductor
47
Chapter 4
Resets, Interrupts, and Low-Power Modes
4.1 Introduction
This section describes the internal and external resets and interrupts of the MC68HC711D3 and its two
low power-consumption modes.
4.2 Resets
The microcontroller unit (MCU) can be reset in any of these four ways:
1.
An active-low input to the RESET pin
2.
A power-on reset (POR) function
3.
A clock monitor failure
4.
A computer operating properly (COP) watchdog timer timeout
The RESET input consists mainly of a Schmitt trigger that senses the RESET line logic level.
4.2.1 RESET Pin
To request an external reset, the RESET pin must be held low for at least eight E-clock cycles, or for one
E-clock cycle if no distinction is needed between internal and external resets.
4.2.2 Power-On Reset (POR)
Power-on reset occurs when a positive transition is detected on VDD. This reset is used strictly for power
turn on conditions and should not be used to detect any drop in the power supply voltage. If the external
RESET pin is low at the end of the power-on delay time, the processor remains in the reset condition until
RESET goes high.
4.2.3 Computer Operating Properly (COP) Reset
The MCU contains a watchdog timer that automatically times out unless it is serviced within a specific
time by a program reset sequence. If the COP watchdog timer is allowed to timeout, a reset is generated,
which drives the RESET pin low to reset the MCU and the external system.
In the MC68HC711D3, the COP reset function is enabled out of reset in normal modes. If the user does
not want the COP enabled, he must write a 1 to the NOCOP bit of the configuration control register
(CONFIG) after reset. This bit is writable only once after reset in normal modes (see 2.3.3 Configuration
Control Register for more information). Protected control bits (CR1 and CR0) in the configuration options
register (OPTION) allow the user to select one of the four COP timeout rates. Table 4-1 shows the
relationship between CR1 and CR0 and the COP timeout period for various system clock frequencies.
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MC68711E20CFNE2 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
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MC68711E20CFNE4 功能描述:8位微控制器 -MCU 8B 20K EPROM 768RAM 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
MC68711E20CFUE2 功能描述:IC MCU 8BIT 64-QFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:HC11 标准包装:1 系列:AVR® ATmega 核心处理器:AVR 芯体尺寸:8-位 速度:16MHz 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:32 程序存储器容量:32KB(16K x 16) 程序存储器类型:闪存 EEPROM 大小:1K x 8 RAM 容量:2K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:44-TQFP 包装:剪切带 (CT) 其它名称:ATMEGA324P-B15AZCT
MC68711E20CFUE3 功能描述:IC MCU 8BIT 64-QFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:HC11 标准包装:1 系列:AVR® ATmega 核心处理器:AVR 芯体尺寸:8-位 速度:16MHz 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:32 程序存储器容量:32KB(16K x 16) 程序存储器类型:闪存 EEPROM 大小:1K x 8 RAM 容量:2K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:44-TQFP 包装:剪切带 (CT) 其它名称:ATMEGA324P-B15AZCT