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参数资料
| 型号： | MC68HCP11A1CFNE3 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, EEPROM, 3 MHz, MICROCONTROLLER, PQCC52 |
| 封装： | PLASTIC, LCC-52 |
| 文件页数： | 144/158页 |
| 文件大小： | 776K |
| 代理商： | MC68HCP11A1CFNE3 |
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MOTOROLA
RESETS, INTERRUPTS, AND LOW POWER MODES
MC68HC11A8
9-6
TECHNICAL DATA
9
9.1.4 Clock Monitor Reset
The clock monitor function is enabled by the CME control bit in the OPTION register.
When CME is clear, the monitor function is disabled. When the CME bit is set, the
clock monitor function detects the absence of an E clock for more than a certain period
of time. The timeout period is dependent on processing parameters and will be be-
tween 5 and 100 microseconds. This means that an E-clock rate of 200 kHz or more
will never cause a clock monitor failure and an E-clock rate of 10 kHz or less will def-
initely cause a clock monitor failure. This implies that systems operating near or below
an E-clock rate of 200 kHz should not use the clock monitor function.
Upon detection of a slow or absent clock, the clock monitor circuit will cause a system
reset. This reset is issued to the external system via the bidirectional RESET pin. The
clock monitor system has a separate reset vector.
Special considerations are needed when using a STOP function and clock monitor in
the same system. Since the STOP function causes the clocks to be halted, the clock
monitor function will generate a reset sequence if it is enabled at the time the STOP
mode is entered.
The clock monitor is useful as a backup for the COP watchdog timer. Since the watch-
dog timer requires a clock to function, it will not indicate any failure if the system clocks
fail. The clock monitor would detect such a failure and force the MCU to its reset state.
Note that clocks are not required for the MCU to reach its reset configuration, although
clocks are required to sequence through reset back to the run condition.
9.1.5 Configuration Options Register (OPTION)
This is a special purpose 8-bit register that is used (optionally) during initialization to
configure internal system configuration options. With the exception of bits 7, 6, and 3
(ADPU, CSEL, and CME) which may be read or written at any time, this register may
be written to only once after a reset and thereafter is a read-only register. If no write is
performed to this location within 64 E-clock cycles after reset, then bits 5, 4, 1, and 0
(IRQE, DLY, CR1, and CR0) will become read-only to minimize the possibility of any
accidental changes to the system configuration (writes will be ignored). While in spe-
cial test modes, the protection mechanism on this register is preempted and all bits in
the OPTION register may be written repeatedly.
ADPU — A/D Power-up
This bit controls operations of the on-chip analog-to-digital converter. When ADPU is
clear, the A/D system is powered down and conversion requests will not return mean-
ingful information. To use the A/D system, this bit should be set. A 100 microsecond
delay is required after ADPU is turned on to allow the A/D system to stabilize.
7
654321
0
$1039
ADPU
CSEL
IRQE
DLY
CME
0
CR1
CR0
OPTION
RESET
00010000
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相关代理商/技术参数 |
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| MC68HCP11A1FN | 制造商:MOTORALA 功能描述: |
| MC68HCP11E0CP2 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC68HCP11E0FN | 功能描述:MICROCONTROLLER MCU 8ADC 3MHC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 标准包装:250 系列:56F8xxx 核心处理器:56800E 芯体尺寸:16-位 速度:60MHz 连通性:CAN，SCI，SPI 外围设备:POR，PWM，温度传感器，WDT 输入/输出数:21 程序存储器容量:40KB（20K x 16） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:6K x 16 电压 - 电源 (Vcc/Vdd):2.25 V ~ 3.6 V 数据转换器:A/D 6x12b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:48-LQFP 包装:托盘 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| MC68HCP11E0FNE | 功能描述:8位微控制器 -MCU 8B MCU 512RAM COP A/D 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 |
| MC68HCP11E1CFNE2 | 功能描述:8位微控制器 -MCU 8B MCU 512 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 |
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