欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數資料
型號: MC68B912B32
廠商: Motorola, Inc.
英文描述: 2.5V 100ppm/Degrees C, 50uA in SOT23-3 Series (Bandgap) Voltage Reference 3-SOT-23 -40 to 125
中文描述: 16位微控制器
文件頁數: 57/128頁
文件大小: 748K
代理商: MC68B912B32
MC68HC912B32
MC68HC912B32TS/D
MOTOROLA
57
10 Clock Functions
Clock generation circuitry generates the internal and external E-clock signals as well as internal clock
signals used by the CPU and on-chip peripherals. A clock monitor circuit, a computer operating properly
(COP) watchdog circuit, and a periodic interrupt circuit are also incorporated into the MC68HC912B32.
10.1 Clock Sources
A compatible external clock signal can be applied to the EXTAL pin or the MCU can generate a clock
signal using an on-chip oscillator circuit and an external crystal or ceramic resonator. The MCU uses
three types of internal clock signals derived from the primary clock signal: T clocks, E clock, and P clock.
The T clocks are used by the CPU. The E and P clocks are used by the bus interfaces, BDM, SPI, and
ATD. The P clock also drives on-chip modules such as the timer chain, SCI, RTI, COP, and restart-from-
stop delay time.
Figure 10
shows clock timing relationships.
Figure 10 Internal Clock Relationships
10.2 Computer Operating Properly (COP)
The COP or watchdog timer is an added check that a program is running and sequencing properly.
When the COP is being used, software is responsible for keeping a free-running watchdog timer from
timing out. If the watchdog timer times out it is an indication that the software is no longer being execut-
ed in the intended sequence; thus a system reset is initiated. Three control bits allow selection of seven
COP time-out periods or COP disable. When COP is enabled, sometime during the selected period the
program must write $55 and $AA (in this order) to the COPRST register. If the program fails to do this
the part will reset. If any value other than $55 or $AA is written to COPRST, the part is reset.
10.3 Real-Time Interrupt
There is a real-time (periodic) interrupt available to the user. This interrupt will occur at one of seven
selected rates. An interrupt flag and an interrupt enable bit are associated with this function. There are
three bits for the rate select.
10.4 Clock Monitor
The clock monitor circuit is based on an internal resistor-capacitor (RC) time delay. If no MCU clock
edges are detected within this RC time delay, the clock monitor can optionally generate a system reset.
The clock monitor function is enabled/disabled by the CME control bit in the COPCTL register. This
time-out is based on an RC delay so that the clock monitor can operate without any MCU clocks.
Clock monitor time-outs are shown in
Table 19
.
T1CLK
T2CLK
T3CLK
T4CLK
INT ECLK
PCLK
HC12B32 CLOCK RELATIONS
相關PDF資料
PDF描述
MC68C912B32FU8 16-Bit Microcontroller
MC68B912B32FU8 16-Bit Microcontroller
MC68C912B32CFU8 16-Bit Microcontroller
MC68CK338 Highly Integrated, Low-Power, 32-Bit Microcontroller
MC68EC060 32-Bit Microprocessors.(32位微處理器)
相關代理商/技術參數
參數描述
MC68B912B32FU8 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16-Bit Microcontroller
MC68BOOL 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-BIT MICROPROCESSING UNIT (MPU)
MC68BOOP 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-BIT MICROPROCESSING UNIT (MPU)
MC68BOOS 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-BIT MICROPROCESSING UNIT (MPU)
MC68C812A4 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Technical Supplement MC68C812A4 3.3V Electrical Characteristics
主站蜘蛛池模板: 五原县| 团风县| 乌拉特前旗| 屏南县| 永靖县| 镇安县| 广东省| 阿拉善左旗| 怀远县| 洮南市| 靖州| 东方市| 江山市| 大化| 芮城县| 赤水市| 安图县| 澄城县| 临沭县| 华阴市| 星座| 宁波市| 墨竹工卡县| 常山县| 凤阳县| 公安县| 内江市| 西吉县| 铜陵市| 黄冈市| 含山县| 额济纳旗| 盘锦市| 大同县| 长武县| 上犹县| 饶河县| 兰州市| 建宁县| 梁平县| 青田县|