参数资料
型号: MC68HC705C9AFNE
厂商: Freescale Semiconductor
文件页数: 57/118页
文件大小: 0K
描述: IC MCU 8BIT 44-PLCC
标准包装: 26
系列: HC05
核心处理器: HC05
芯体尺寸: 8-位
速度: 2.1MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 24
程序存储器容量: 16KB(16K x 8)
程序存储器类型: OTP
RAM 容量: 352 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
MC68HC05C12A Compatible COP Clear Register
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
43
5.7 MC68HC05C12A Compatible COP Clear Register
The COP clear register, shown in Figure 5-6, resets the C12A COP counter.
COPC — Computer Operating Properly Clear Bit
Preventing a COP reset is achieved by writing a 0 to the COPC bit. This action will reset the counter
and begin the timeout period again. The COPC bit is bit 0 of address $3FF0. A read of address $3FF0
will result in the data programmed into the mask option register PBMOR.
5.8 COP During Wait Mode
Either COP will continue to operate normally during wait mode. The software must pull the device out of
wait mode periodically and reset the COP to prevent a system reset.
5.9 COP During Stop Mode
Stop mode disables the oscillator circuit and thereby turns the clock off for the entire device. The COP
counter will be reset when stop mode is entered. If a reset is used to exit stop mode, the COP counter will
be reset after the 4064 cycles of delay after stop mode. If an IRQ is used to exit stop mode, the COP
counter will not be reset after the 4064-cycle delay and will have that many cycles already counted when
control is returned to the program.
In the event that an inadvertent STOP instruction is executed, neither COP will allow the system to
recover. The MC68HC705C9A offers two solutions to this problem, one available in C9A mode (see 5.9.1
Clock Monitor Reset) and one available in C12A mode (see 5.9.2 STOP Instruction Disable Option).
5.9.1 Clock Monitor Reset
When configured as a C9A, the clock monitor circuit can provide a system reset if the clock stops for any
reason, including stop mode. When the CME bit in the C9A COP control register is set, the clock monitor
detects the absence of the internal bus clock for a certain period of time. The timeout period is dependent
on the processing parameters and varies from 5
s to 100 s, which implies that systems using a bus
clock rate of 200 kHz or less should not use the clock monitor.
If a slow or absent clock is detected, the clock monitor causes a system reset. The reset is issued to the
external system via the bidirectional RESET pin for four bus cycles if the clock is slow or until the clocks
recover in the case where the clocks are absent.
$3FF0
Bit 7
6543
2
1
Bit 0
Read:
Write:
COPC
Reset:
000
U
0
= Unimplemented
U = Undetermined
Figure 5-6. COP Clear Register (COPCLR)
相关PDF资料
PDF描述
VI-B5N-CU-F2 CONVERTER MOD DC/DC 18.5V 200W
MC68HC705C8AVFNE IC MCU 8BIT 44-PLCC
VJ1825Y823JBGAT4X CAP CER 0.082UF 1KV 5% X7R 1825
VI-B5M-CU-F3 CONVERTER MOD DC/DC 10V 200W
MC68HCP11E0FNE IC MCU 8BIT 52-PLCC
相关代理商/技术参数
参数描述
MC68HC705C9AVFNE 功能描述:8位微控制器 -MCU 8B MCU 352 BYTES RAM 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
MC68HC705E6CDW 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
MC68HC705G1B 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HC705J1A 制造商:Freescale Semiconductor 功能描述:
MC68HC705J1ACDW 功能描述:IC MCU 4MHZ 1.2K OTP 20-SOIC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:HC05 其它有关文件:STM32F101T8 View All Specifications 特色产品:STM32 32-bit Cortex MCUs 标准包装:490 系列:STM32 F1 核心处理器:ARM? Cortex?-M3 芯体尺寸:32-位 速度:36MHz 连通性:I²C,IrDA,LIN,SPI,UART/USART 外围设备:DMA,PDR,POR,PVD,PWM,温度传感器,WDT 输入/输出数:26 程序存储器容量:64KB(64K x 8) 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:10K x 8 电压 - 电源 (Vcc/Vdd):2 V ~ 3.6 V 数据转换器:A/D 10x12b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:36-VFQFN,36-VFQFPN 包装:托盘 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名称:497-9032STM32F101T8U6-ND