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| 型號： | MC68HCP11A1VP2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | HCMOS Single-Chip Microcontroller |
| 中文描述： | 8-BIT, 2 MHz, MICROCONTROLLER, PDIP48 |
| 封裝： | DIP-48 |
| 文件頁數(shù)： | 86/158頁 |
| 文件大小： | 776K |
| 代理商： | MC68HCP11A1VP2 |
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MOTOROLA
9-6
RESETS, INTERRUPTS, AND LOW POWER MODES
MC68HC11A8
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
6
5
4
3
2
0
0
1
0
$
1
039
RESET
ADPU
0
CSEL
0
IRQE
0
DLY
1
CME
0
CR1
0
CR0
0
OPTION
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| MC68HCP11E0CP2 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC68HCP11E0FN | 功能描述:MICROCONTROLLER MCU 8ADC 3MHC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 標(biāo)準(zhǔn)包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設(shè)備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 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 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)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 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC68HCP11E1CFNE3 | 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 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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