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During reset, the X bit in the condition code. The state of these pins during reset determine the MCU operating mode.

68HC12 Datasheet(PDF) – Motorola, Inc

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. Most datasheets listed on this page may be downloaded as a single 6. Connecting Hardware to the 9S12 Processor.

68HC12 datasheet & applicatoin notes – Datasheet Archive

For a brief introduction to the microcontroller used, see the datwsheet. 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.


The BKGD pin has an.

MCU will recognize another interrupt as soon as the interrupt mask bit in. There is an active pull-up on this pin while in reset and immediately out of reset. Home – IC Supply – Link. The BKGD pin receives and transmits serial background debugging. 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.

Freescale HCS12 9S12 Datasheets

Overview of the MC9S12A microcontroller. 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.

The XIRQ input provides a means of requesting a nonmaskable interrupt. Mosaic Industries web site.

There is an active pull-up on this pin while in reset. If the interrupt line is held low, the. Even so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: This manual describes the features and operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers.


MODB have active pull-downs during reset. Index to all documents, tutorials, and user guides. 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 detailed specifications provide the timing information you may sometimes need when writing c language application programs.

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. Pre-coded C-language routines make it easy to access these features.

A special self-timing protocol is used.

This page is about: XIRQ is often used as a power loss detect interrupt. Using this Doc Web.

Because the XIRQ input is level sensitive, it can be connected. The pull-up can be turned off by clearing. XIRQ is datasbeet used as a power loss detect.