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參數資料
型號: MC68HCP11A1CFN3
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, EEPROM, 3 MHz, MICROCONTROLLER, PQCC52
封裝: PLASTIC, LCC-52
文件頁數: 85/158頁
文件大小: 776K
代理商: MC68HCP11A1CFN3
MC68HC11A8
TECHNICAL DATA
RESETS, INTERRUPTS, AND LOW POWER MODES
MOTOROLA
9-5
9
of reset. The DLY control bit is set to specify that an oscillator start-up delay is imposed
upon recovery from STOP mode. The clock monitor system is disabled by CME equal
zero.
9.1.3 Computer Operating Properly (COP) Reset
The MCU includes a computer operating properly watchdog system to help protect
against software failures. To use a COP watchdog timer, a watchdog timer reset se-
quence must be executed on a regular periodic basis so that the watchdog timer is
never allowed to time out.
The internal COP function includes special control bits which permit specification of
one of four time out periods and even allows the function to be disabled completely.
The COP system has a separate reset vector.
The NOCOP control bit, which determines whether or not a watchdog timeout causes
a system reset, is implemented in an EEPROM cell in the CONFIG register. Once pro-
grammed, this bit remains set (or cleared) even when no power is applied, and the
COP function is enabled or disabled independent of resident software. The NOCOP
control bit may be preempted while in special modes to prevent the COP system from
causing a hardware reset.
Two other control bits in the OPTION register select one of four timeout durations for
the COP timer. The actual timeout period is dependent on the system E clock frequen-
cy, but for reference purposes,
Table 9-1
shows the relationship between the CR1 and
CR0 control bits and the COP timeout period for various system clock frequencies.
The default reset condition of the CR1 and CR0 bits is cleared which corresponds to
the shortest timeout period.
The sequence required to reset the watchdog timer is:
1. Write $55 to the COP reset register (COPRST) at $103A, followed by
2. Write $AA to the same address.
Both writes must occur in correct order prior to timeout but, any number of instructions
may be executed between the writes. The elapsed time between adjacent software re-
set sequences must never be greater than the COP time out period. Reading the CO-
PRST register does not return meaningful data and does not affect the watchdog
timer.
Table 9-1 COP Timeout Period versus CR1 and CR0
CR1 CR0
Rate
XTAL = 12.0
MHz Timeout
–0/+10.9 ms
10.923 ms
43.691 ms
174.76 ms
699.05 ms
3.0 MHz
XTAL = 2
23
Timeout
– 0/+15.6 ms
15.625 ms
62.5 ms
250 ms
1 s
2.1 MHz
XTAL = 8.0 MHz
Timeout
– 0/+16.4 ms
16.384 ms
65.536 ms
262.14 ms
1.049 s
2.0 MHz
XTAL = 4.9152
MHz Timeout
– 0/+26.7 ms
XTAL = 4.0 MHz
Timeout
– 0/+32.8 ms
32.768 ms
131.07 ms
524.29 ms
2.1 s
1.0 MHz
XTAL = 3.6864
MHz Timeout
– 0/+35.6 ms
0
0
1
1
0
1
0
1
2
15
÷
E
2
17
÷
E
2
19
÷
E
2
21
÷
E
E =
26.667 ms
106.67 ms
426.67 ms
1.707 s
1.2288 MHz
35.556 ms
142.22 ms
568.89 ms
2.276 s
921.6 kHz
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相關代理商/技術參數
參數描述
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 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:HC11 標準包裝: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 外圍設備:POR,PWM,溫度傳感器,WDT 輸入/輸出數: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 數據轉換器:A/D 6x12b 振蕩器型:內部 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 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
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