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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.
This pin is always an input and can always be read. There is an active pull-up on this pin datashewt in reset and immediately out of reset. Most datasheets listed on this page may be downloaded as a single 6. These following Freescale datasheets are provided to supplement the documentation on this website.
Whenever XIRQ or IRQ are used with multiple interrupt sources IRQ must be configured for level-sensitive operation if there is more than one source of IRQ interrupteach source must drive the interrupt input with an open-drain type of driver to avoid contention between outputs. The BKGD pin has an.
Freescale HCS12 9S12 Datasheets
Using this Doc Web. Connecting Hardware to the 9S12 Processor. The XIRQ input provides a means of requesting a nonmaskable interrupt.
Even so, as a service to those looking for descriptions of the protocol, datashet datasheets are provided here: Pre-coded C-language routines make it easy to access these features. Home – IC Supply – Link. MCU will recognize another interrupt as soon as the interrupt mask bit in.
The pull-up can be turned off by clearing. As the user manual for its Enhanced Capture Time module provides some specifications that were neglected in the manual for the MC9S12DP version, 68gc12 is provided here.
Overview of the MC9S12A microcontroller. Datashfet the interrupt line is held low, the. This pin is always an input and. XIRQ is often used as a power loss detect interrupt. If the interrupt line is held low, the MCU will recognize another interrupt as soon as the interrupt mask bit in the MCU is cleared normally upon return from an interrupt.
The state of these pins during reset determine the MCU operating mode. This manual describes the features and operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers.
There is an active pull-up on this pin while in reset. The BKGD pin receives and transmits serial background debugging.
68HC12 datasheet & applicatoin notes – Datasheet Archive
Mosaic Industries web site. The Module Mapping Control Guide shows you how to use the eatasheet registers for the HCS12 Microcontroller and how to configure the device’s memory map.
A special self-timing protocol is used. For a brief introduction to the microcontroller used, see the following:. During reset, the X bit in the condition code.
XIRQ is often used as a power loss detect. MODB have active pull-downs during reset. Device Overview and Block Diagram. Index to all documents, tutorials, and user guides. This page is about: Because the XIRQ input is level sensitive, it can be connected. Beware however that it is not always clear which specifications are shared by the two versions, and which apply only to the X-version of the processor.
The detailed specifications provide the timing information you may sometimes need when writing c language application programs.