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MC68HC11P1CFN3 参数 Datasheet PDF下载

MC68HC11P1CFN3图片预览
型号: MC68HC11P1CFN3
PDF下载: 下载PDF文件 查看货源
内容描述: 微控制器 [Microcontrollers]
分类和应用: 微控制器
文件页数/大小: 268 页 / 2323 K
品牌: FREESCALE [ Freescale ]
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Freescale Semiconductor, Inc.  
Pin Descriptions  
2.8 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 (OPTION register). IRQ is  
always configured to level sensitive triggering at reset.  
NOTE: Connect an external pull-up resistor, typically 4.7 k¾, to VDD when IRQ  
is used in a level sensitive wired-OR configuration. See also  
Nonmaskable interrupt (XIRQ/VPPE).  
2.9 Nonmaskable interrupt (XIRQ/VPPE)  
The XIRQ input provides a means of requesting a non-maskable  
interrupt after reset initialization. During reset, the X bit in the condition  
code register (CCR) is set and any interrupt is masked until MCU  
software enables it. Because the XIRQ input is level-sensitive, it can be  
connected to a multiple-source wired-OR network with an external pull-  
up resistor to VDD. XIRQ is often used as a power loss detect interrupt.  
Whenever XIRQ or IRQ is used with multiple interrupt sources (IRQ  
must be configured for level sensitive 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  
should be a single pull-up resistor near the MCU interrupt input pin  
(typically 4.7 k¾). There must also be an interlock mechanism at each  
interrupt source so that the source holds the interrupt line low until the  
MCU recognizes and acknowledges the interrupt request. If one or more  
interrupt source is still pending after the MCU services a request, the  
interrupt line will still be held low and the MCU will be interrupted again  
as soon as the interrupt mask bit in the MCU is cleared (normally upon  
return from an interrupt). Refer to Resets and Interrupts.  
The VPPE pin is used to input the external EPROM programming  
voltage, which must be present during EPROM programming.  
Technical Data  
MC68HC11P2 — Rev 1.0  
Pin Descriptions  
For More Information On This Product,  
Go to: www.freescale.com  
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