参数资料
型号: MC68711E20CFNE2
厂商: Freescale Semiconductor
文件页数: 82/138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)
Resets, Interrupts, and Low-Power Modes
MC68HC711D3 Data Sheet, Rev. 2.1
48
Freescale Semiconductor
The sequence for resetting the watchdog timer is:
1.
Write $55 to the COP reset register (COPRST) to arm the COP timer clearing mechanism.
2.
Write $AA to the COPRST register to clear the COP timer
Both writes must occur in this sequence prior to the timeout, but any number of instructions can be
executed between the two writes.
4.2.4 Clock Monitor Reset
The MCU contains a clock monitor circuit that measures the E-clock frequency. If the E-clock input rate
is above approximately 200 kHz, then the clock monitor does not generate an MCU reset. If the E-clock
signal is lost or its frequency falls below 10 kHz, then an MCU reset can be generated, and the RESET
pin is driven low to reset the external system.
4.2.5 System Configuration Options Register
The system configuration options register (OPTION) is a special-purpose register with several
time-protected bits. OPTION is used during initialization to configure internal system options.
Bits 5, 4, 2, 1, and 0 can be written only once during the first 64 E-clock cycles after reset in normal modes
(where the HPRIO register bit (SMOD) is cleared). In special modes (where SMOD = 1), the bits can be
written at any time. Bit 3 can be written at anytime.
Table 4-1. COP Time Out Periods
CR0 CR1
E
÷ 215
Divided
By
XTAL = 223
Time Out
–0/+15.6 ms
XTAL =
8.0 MHz
Time Out
–0/+16.4 ms
XTAL =
4.9152 MHz
Time Out
–0/+26.7 ms
XTAL =
4.0 MHz
Time Out
–0/+32.8 ms
XTAL =
3.6864 MHz
Time Out
–0/+35.6 ms
0
1
15.625 ms
16.384 ms
26.667 ms
32.768 ms
35.556 ms
0
1
4
62.5 ms
65.536 ms
106.67 ms
131.07 ms
142.22 ms
1
0
16
250 ms
262.14 ms
426.67 ms
524.29 ms
568.89 ms
1
64
1 sec
1.049 sec
1.707 sec
2.1 sec
2.276 ms
E =
2.1 MHz
2.0 MHz
1.2288 MHz
1.0 MHz
921.6 kHz
Address:
$003A
Bit 7
654321
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
00000000
Figure 4-1. Arm/Reset COP Timer Circuitry Register (COPRST)
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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
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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