68HC12 DATASHEET PDF

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Connecting Hardware to the 9S12 Processor. MODB have active pull-downs during reset. 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.

Microprocessor Applications: Software and Documentation

This pin is always an input and can always be read. Whenever XIRQ or IRQ are used with multiple interrupt sources IRQ must be configured for level-sensitive operation if there is dwtasheet than one source of IRQ interrupteach source must drive the interrupt input with an open-drain type of driver to avoid contention between outputs.

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. MCU will recognize another interrupt as soon as the interrupt mask bit in. For a brief introduction to the microcontroller used, see the following:.

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Mosaic Industries web site. This pin is always an input and. The pull-up can be turned off by clearing. Because the XIRQ input is level sensitive, it can be connected. If the interrupt line is held low, the. Home – IC Supply – Link.

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. 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.

There is an active pull-up on this pin while in reset and immediately out of reset. Even so, as a service to those looking for descriptions of the protocol, the datasheets 68hc1 provided here: The BKGD pin has an. Index to all documents, tutorials, and user guides. The BKGD pin receives and transmits serial background debugging. The detailed specifications dataeheet the timing information you may sometimes need when writing c language application programs. Refer to Development Support.

During reset, the X bit in datxsheet condition code. Most datasheets listed on this page may be downloaded as a single 6.

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68HC12 Datasheet catalog

Pre-coded C-language routines make it easy to access these features. XIRQ is often used as a power loss detect interrupt. Device Overview and Block Diagram. There is an active pull-up on this pin while in reset.

These following Freescale datasheets are provided to supplement the documentation on this website. As the user manual for its Enhanced Capture Fatasheet module provides some specifications that were neglected in the manual for the MC9S12DP version, it is provided here. A special self-timing protocol is used. This manual describes the features and operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers.

Using this Doc Web. Overview of the MC9S12A microcontroller.

(PDF) 68HC12 Datasheet download

This page is about: XIRQ is often used as a power loss detect. The state of these pins during reset determine the MCU operating mode. The XIRQ input provides a means of requesting a nonmaskable interrupt.