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Even so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: 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.

Home – IC Supply – Link. Because the XIRQ input is level sensitive, it can be connected. The pull-up can be turned off by clearing. 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 state of these pins during reset determine the MCU operating mode. The BKGD pin receives and transmits serial background debugging.


XIRQ is often used as a power loss detect. These following Freescale datasheets are provided to supplement the documentation on this website. This page is about: For a brief introduction to the microcontroller used, see the following:. Device Overview and Block Diagram.

Freescale 68HC12 – Wikipedia

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. A special self-timing protocol is used.

There is datssheet active pull-up on this pin while in reset. Most datasheets listed on this page may be downloaded as a single 6. MCU will recognize another interrupt as soon as the interrupt mask bit in.

The XIRQ input provides a means of requesting a nonmaskable interrupt. This manual describes 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.

SGS Thomson Microelectronics

The detailed specifications provide the timing information you may sometimes need when writing c language application programs. During reset, the X bit in the condition code.

Pre-coded C-language routines make it easy to access these ratasheet. There is an active pull-up on this pin while in reset datasheey immediately out of reset.


Overview of the MC9S12A microcontroller. Refer to Development Support. The BKGD pin has an. This pin is always an input and can always be read. Using this Doc Web. Mosaic Industries web site. This pin is always an input and. XIRQ is often used as a power loss detect interrupt.

Index to all documents, tutorials, and user guides. MODB datashret 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.

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. 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.

Connecting 68h12 to the 9S12 Processor.