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: MC68B912B32FU8
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 16-Bit Microcontroller
中文描述: 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數: 12/128頁
文件大小: 748K
代理商: MC68B912B32FU8
MOTOROLA
12
MC68HC912B32
MC68HC912B32TS/D
3.3.3 Reset (RESET)
An active low bidirectional control signal, RESET, acts as an input to initialize the MCU to a known start-
up state. It also acts as an open-drain output to indicate that an internal failure has been detected in
either the clock monitor or COP watchdog circuit. The MCU goes into reset asynchronously and comes
out of reset synchronously. This allows the part to reach a proper reset state even if the clocks have
failed, while allowing synchronized operation when starting out of reset.
It is possible to determine whether a reset was caused by an internal source or an external source. An
internal source drives the pin low for 16 cycles; eight cycles later the pin is sampled. If the pin has re-
turned high, either the COP watchdog vector or clock monitor vector will be taken. If the pin is still low,
the external reset is determined to be active and the reset vector is taken. Hold reset low for at least 32
cycles to assure that the reset vector is taken in the event that an internal COP watchdog time-out or
clock monitor fail occurs.
3.3.4 Maskable Interrupt Request (IRQ)
The IRQ input provides a means of applying asynchronous interrupt requests to the MCU. Either falling
edge-sensitive triggering or level-sensitive triggering is program selectable (INTCR register). IRQ is al-
ways configured to level-sensitive triggering at reset. When the MCU is reset the IRQ function is
masked in the condition code register.
This pin is always an input and can always be read. In special modes it can be used to apply external
EEPROM V
PP
in support of EEPROM testing. External V
PP
is not needed for normal EEPROM program
and erase cycles. Because the IRQ pin is also used as an EEPROM programming voltage pin, there is
an internal resistive pull-up on the pin.
3.3.5 Nonmaskable Interrupt (XIRQ)
The XIRQ input provides a means of requesting a nonmaskable interrupt after reset initialization. During
reset, the X bit in the condition code register (CCR) is set and any interrupt is masked until MCU soft-
ware enables it. Because the XIRQ input is level sensitive, it can be connected to a multiple-source
wired-OR network. This pin is always an input and can always be read. There is an active pull-up on
this pin while in reset and immediately out of reset. The pull-up can be turned off by clearing PUPE in
the PUCR register. XIRQ is often used as a power loss detect interrupt.
Whenever XIRQ or IRQ are used with multiple interrupt sources (IRQ must be configured for level-sen-
sitive operation if there is more than one source of IRQ interrupt), each source must drive the interrupt
input with an open-drain type of driver to avoid contention between outputs. There must also be an in-
terlock mechanism at each interrupt source so that the source holds the interrupt line low until the MCU
recognizes and acknowledges the interrupt request. If the interrupt line is held low, the MCU will recog-
nize another interrupt as soon as the interrupt mask bit in the MCU is cleared (normally upon return from
an interrupt).
3.3.6 Mode Select (SMODN, MODA, and MODB)
The state of these pins during reset determine the MCU operating mode. After reset, MODA and MODB
can be configured as instruction queue tracking signals IPIPE0 and IPIPE1. MODA and MODB have
active pulldowns during reset.
The SMODN pin can be used as BKGD or TAGHI after reset.
3.3.7 Single-Wire Background Mode Pin (BKGD)
The BKGD pin receives and transmits serial background debugging commands. A special self-timing
protocol is used. The BKGD pin has an active pull-up when configured as input; BKGD has no pull-up
control. Refer to
16 Development Support
.
相關PDF資料
PDF描述
MC68C912B32CFU8 16-Bit Microcontroller
MC68CK338 Highly Integrated, Low-Power, 32-Bit Microcontroller
MC68EC060 32-Bit Microprocessors.(32位微處理器)
MC68EN360RC25V QUad Integrated Communications Controller Users Manual
MC68EN360CFE25 QUad Integrated Communications Controller Users Manual
相關代理商/技術參數
參數描述
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
MC68C912B32CFU8 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16-Bit Microcontroller
主站蜘蛛池模板: 广德县| 连平县| 都昌县| 佛教| 常德市| 紫阳县| 高邮市| 无棣县| 莒南县| 萍乡市| 辽中县| 萨嘎县| 利川市| 新平| 西宁市| 平乐县| 高淳县| 渝中区| 东至县| 蒲城县| 漠河县| 拉孜县| 武安市| 正蓝旗| 石狮市| 建阳市| 老河口市| 咸丰县| 洞口县| 桑植县| 龙游县| 黑山县| 喀喇沁旗| 定兴县| 湘西| 石河子市| 荃湾区| 昆明市| 娄底市| 凤城市| 波密县|