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This pin is always an input and can always be read. The BKGD pin has an.
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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. The XIRQ input provides a means of requesting a nonmaskable interrupt. This page is about: Using this Doc Web. XIRQ is often used as a power loss detect interrupt. The state of these pins during reset determine the MCU operating mode. This pin is always an input and.
These following Freescale datasheets are provided to supplement the documentation on this website. 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.
The detailed specifications provide the timing information you may sometimes need when writing c language application programs. MODB have active pull-downs during reset. 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. Because the XIRQ input is level sensitive, it can be connected.
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.
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 pull-up can be turned off by clearing. Connecting Hardware to the 9S12 Processor. Mosaic Industries web site.
68HC12 Datasheet catalog
During reset, the X bit in the condition code. 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. Device Overview and Block Diagram. Overview of the MC9S12A microcontroller. Home – IC Supply – Link. Most datasheets listed on this page may be downloaded as a single 6. Refer to Development Support.
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. There is an active pull-up on this pin while in reset. If the interrupt line is held low, the. The BKGD pin receives and transmits serial background debugging.
A special self-timing protocol is used. Index to all documents, tutorials, and user guides.
The Module Mapping Control Guide shows you how to use the control registers for datasehet HCS12 Microcontroller and how to configure the device’s memory map. For a brief introduction to the microcontroller used, see the following:. XIRQ is often used as a power loss detect. Pre-coded C-language routines make it easy to access these features.