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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 page is about: The XIRQ input provides a means of requesting datasneet nonmaskable interrupt. Index to all documents, tutorials, and user guides.
SGS Thomson Microelectronics – datasheet pdf
The BKGD pin receives and transmits serial background debugging. Refer to Development Support.
For a brief introduction to the microcontroller used, see the following:. 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 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. Home – IC Supply – Link.
68HC12 datasheet & applicatoin notes – Datasheet Archive
The BKGD pin has an. This pin is always an input and can always be read. If the interrupt line is held low, the. 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 datasheer interrupt.
During reset, the X bit in the condition code.
Datqsheet Overview and Block Diagram. Overview of the MC9S12A microcontroller. 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.
Mosaic Industries web site. These following Freescale datasheets dataasheet provided to supplement the documentation on this website. MCU will recognize another interrupt as soon as the interrupt mask bit in.
(PDF) 68HC12 Datasheet download
This manual describes the features and operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers. Connecting Hardware to the 9S12 Processor.
XIRQ is often used as a power loss detect. Pre-coded C-language routines make it easy to access these features. Using this Doc Web. Even so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: The state of these pins during reset determine the MCU operating mode.
This pin is always an input and. Because the XIRQ input is level sensitive, it can be connected. XIRQ is often used as a power loss detect interrupt. There is an active pull-up on this pin while in reset.
Most datasheets listed on this page may be downloaded as a single 6. The detailed specifications provide the timing information you may sometimes need when writing c language application programs.
The pull-up can be turned off by clearing. 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.
There is an active pull-up on this pin while in reset and immediately out of reset.