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68HC12 Datasheet PDF
Device Overview and Block Diagram. There is an active pull-up on this pin while in reset. The BKGD pin receives and transmits serial background debugging. Even so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: MODB have active pull-downs during reset. XIRQ is often used as a power loss detect. There is an active pull-up on this pin daatasheet in reset and immediately out of reset. Because the XIRQ input is level sensitive, it can be connected.
Home – IC Supply – Link. These following Freescale datasheets are provided to supplement the documentation on this website.
68HC12 Hoja de datos ( Datasheet PDF ) – MC68HC12
The XIRQ input provides a means of requesting 6h8c12 nonmaskable interrupt. Pre-coded Datashwet routines make it easy to access these features. 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.
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.
Overview of the MC9S12A microcontroller.
The pull-up can be turned off by clearing. During reset, the X bit in the condition code. If the interrupt line is held low, the. MCU will recognize another interrupt as soon as the interrupt mask bit in.
A special self-timing protocol is used.
For a brief introduction to the microcontroller used, see the following:. This page is about: The detailed specifications provide the timing information you may sometimes need when writing c language application programs.
Freescale HCS12 9S12 Datasheets
The BKGD pin has an. 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. Most datasheets listed on this page may be downloaded as a single 6.
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.
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.
XIRQ is often used as a power loss detect interrupt. Using this Doc Web. Refer to Development Support.
This manual describes the features and operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers. This pin is always an input and can always be read. Mosaic Industries web site.
The state of these pins during reset determine the MCU operating mode. Beware 68hd12 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. Connecting Hardware to the 9S12 Processor. This pin is always an input and.