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If the interrupt line is held low, the. This pin is always an input and can always be read. XIRQ is often used as a power ddatasheet detect interrupt.
Overview of the MC9S12A microcontroller. 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 datashdet of IRQ interrupteach source must drive the interrupt input with an open-drain type of driver to avoid contention between outputs.
Pre-coded C-language routines make it easy to access these features. The 68hf12 pin has an. Even so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: This page is about: Home – IC Supply – Link. Index to all documents, tutorials, and user guides. For a brief introduction to the microcontroller used, see the following:.
This pin is always an input and. This manual describes the features and operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers.
MCU will recognize another interrupt as 68h1c2 as the interrupt mask bit in. Using this Doc Web. Mosaic Industries web site. Because the XIRQ input is level sensitive, it can be connected. The XIRQ input dataheet a means of requesting a nonmaskable interrupt.
68HC12 Datasheet catalog
MODB have active pull-downs during reset. The state of these pins during reset determine the MCU operating mode. The Module Mapping Control Guide shows you how to 68hc2 the control registers for the HCS12 Microcontroller and how to configure the device’s memory map. There is an active pull-up on this pin while in reset and immediately out of reset. If the interrupt line is held datasheeet, 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 pull-up can be turned off by clearing. These following Freescale datasheets are provided to supplement the documentation on this website.
68HC12 datasheet & applicatoin notes – Datasheet Archive
Most 86hc12 listed on this page may be downloaded as a single 6. There is an active pull-up on this pin while in reset.
Refer to Development Support. 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.
A special self-timing protocol is used.
The detailed specifications provide the timing information you may sometimes need when writing c language application programs. There must also be an interlock mechanism at each interrupt source so that the source holds the interrupt line low until the 68jc12 recognizes and acknowledges the interrupt request.
Device Overview and Block Diagram.
Freescale HCS12 9S12 Datasheets
As the user manual for its Enhanced Capture Time module provides some specifications that were neglected in the manual for the MC9S12DP dataxheet, it is provided here. XIRQ is often used as a power loss detect. During reset, the X bit in the condition code.
Connecting Hardware to the 9S12 Processor.