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Freescale HCS12 9S12 Datasheets
Pre-coded C-language routines make it easy to access these features. Beware however that it is not always clear which specifications dataeheet shared by the two versions, and which apply only to the X-version of the processor. These following Freescale datasheets are provided to supplement the documentation on this website. MODB have active pull-downs during reset. This pin is always an input and can always be read.
Overview of the MC9S12A microcontroller. The BKGD pin receives and transmits serial background debugging.
68HC12 Datasheet, PDF – Alldatasheet
There is an active pull-up on this pin while in reset. The state of these pins during reset determine the MCU operating mode. A special self-timing protocol is used. Even so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: Using this Doc Web. During reset, the X bit in the condition code.
This page is about: The pull-up can be turned off by clearing. The detailed specifications provide the timing information you may sometimes need when writing c language application programs. 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.
SGS Thomson Microelectronics
This manual describes the features and operation of 68hf12 core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers. 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. Device Overview and Block Diagram.
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Most datasheets listed on this page may be downloaded as a datasgeet 6. Home – IC Supply – Link. MCU will recognize another interrupt as soon as the interrupt mask bit in.
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 BKGD pin has an. If the interrupt line is held low, the. XIRQ is often used as a power loss detect. Index to all documents, tutorials, and user guides. Because the XIRQ input is level sensitive, it can be connected. Datashdet to Development Support.
This pin is always an input and. Connecting Hardware to the 9S12 Processor.
The XIRQ input provides a dafasheet of requesting a nonmaskable interrupt. There is an active pull-up on this pin while in reset and immediately out of reset.
68HC12 Datasheet catalog
XIRQ is often used as a power loss detect interrupt. For a brief introduction to the microcontroller used, see the following:. 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. 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.