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During reset, the X bit in the condition code. XIRQ is often used as a power loss detect.

Home – IC Supply – Link. This pin is always an input and can always be read.

Freescale 68HC12

The pull-up can be turned off by clearing. The Module Mapping Control Guide shows you how to use the control registers for the HCS12 Microcontroller and how to configure the device’s memory map.

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 XIRQ input provides a means of requesting a nonmaskable interrupt. MODB have active pull-downs during reset.

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Index to all documents, tutorials, and user guides. These following Freescale datasheets dwtasheet provided to supplement the documentation on this website. There is an active pull-up on this pin while in reset and immediately out of reset. MCU will recognize another interrupt as soon as the interrupt mask bit in.

Microprocessor Applications: Software and Documentation

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.

Most datasheets listed on this page may be downloaded as a single 6.

There is an active pull-up on this pin while in reset. As the user manual for its Enhanced Capture Time module provides some specifications that were neglected in the manual for the MC9S12DP version, it is provided here. If the interrupt line is held low, the. A special self-timing protocol is used. For a brief introduction to the microcontroller used, see the following:. 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 manual describes the features and operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers. Mosaic Industries web site. The BKGD pin receives and transmits serial background debugging. XIRQ is often used as a power loss detect interrupt. Pre-coded C-language routines make it easy to access these features.

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Freescale HCS12 9S12 Datasheets

Even so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: The detailed specifications provide the timing information you may sometimes need when writing c language application programs. This pin is always an input and. Connecting Hardware to the 9S12 Processor. Device Overview and Block Diagram.

Overview of the MC9S12A microcontroller. If the interrupt line is held low, the MCU will recognize another interrupt as soon as the datasheett mask bit in the MCU is cleared normally upon return from an interrupt. This page is about: Because the Datashete input is level sensitive, it can be connected.

Refer to Development Support. The BKGD pin has an. The state of these pins during reset determine the MCU operating mode.

Using this Doc Web.