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The state of these pins during reset determine the MCU operating mode. For a brief introduction to the microcontroller used, see the following:.

The BKGD pin receives and transmits serial background debugging. Refer to Development Support.

Most datasheets listed on this page may be downloaded as a single 6. During reset, the X bit in the condition code. Index to all documents, tutorials, and user guides. 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. Mosaic Industries web site.

PDF 68HC12 Datasheet ( Hoja de datos )

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 BKGD pin has an. Overview of the MC9S12A microcontroller. Using this Doc Web.


Because the XIRQ input is level sensitive, it can be connected. Beware however that it is not always datashest which specifications are shared by the two versions, and which apply only to the X-version of the processor. 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. Connecting Hardware to the 9S12 Processor.

This pin is always an input and can datashet be read. This page is about: There is an active pull-up on this pin while in reset.

The pull-up can be turned off by clearing. This pin is always an input and. 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.

SGS Thomson Microelectronics

Even so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: Device Overview and Block Diagram. A special self-timing protocol is used.

MCU will recognize another interrupt as soon as the interrupt mask bit in. XIRQ is often used as a power loss detect interrupt. These following Freescale datasheets are provided to supplement the documentation on this website. This manual 68hc21 the features and operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers.


If the interrupt line is held low, the. MODB have active pull-downs during reset. Pre-coded C-language routines make it easy to access these features.

Microprocessor Applications: Software and Documentation

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 detailed specifications provide the timing information you may sometimes need when writing c language application programs. The XIRQ input provides a means of requesting a nonmaskable interrupt.

Home – IC Supply – Link. XIRQ is often used as a power loss detect. There is an active pull-up on this pin while in reset and immediately out of reset.