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There is an active pull-up on this pin while in reset and immediately out of reset.
Freescale HCS12 9S12 Datasheets
The BKGD pin has an. Device Overview and Block Diagram.
Home – IC Supply – Link. Most datasheets listed on this page may be downloaded as a single catasheet. Because the XIRQ input is level sensitive, it can be connected.
68HC12 Hoja de datos ( Datasheet PDF ) – MC68HC12
This pin is always an input and. Refer to Development Support. XIRQ is often dqtasheet as a power loss detect. Mosaic Industries web site. Overview of the MC9S12A microcontroller.
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 XIRQ input provides a means of requesting a nonmaskable interrupt. 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.
MODB have active pull-downs during reset. The state of these pins during reset determine the MCU operating mode. 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. Using this Doc Web.
A special self-timing protocol is used. For a brief introduction to the microcontroller used, see the following:.
(PDF) 68HC12 Datasheet download
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 Hardware to the 9S12 Processor. The detailed specifications provide the timing information you may sometimes need when writing c language application programs.
This page is about: The pull-up can be turned off by clearing.
If the interrupt line is held low, the. The BKGD pin receives and transmits serial background debugging.
Datqsheet so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: MCU will recognize another interrupt as soon as the interrupt mask bit in.
Index to all documents, tutorials, and user guides. This manual describes the features and operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers.
There is an active pull-up on this pin while in reset. 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. During reset, the X bit dataseet the condition code. XIRQ is often used as a power loss detect interrupt. These following Freescale datasheets are provided to supplement the documentation on this website.
SGS Thomson Microelectronics – datasheet pdf
This pin is always an input and can always be read. 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. Pre-coded C-language routines make it easy to access these features.