MODB have active pull-downs during reset. XIRQ is often used as a power loss detect. The detailed specifications provide the timing information you may sometimes need when writing c language application programs. Device Overview and Darasheet Diagram. Connecting Hardware to the 9S12 Processor.
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. Index to all documents, tutorials, and user guides. A special self-timing protocol is used.
During reset, the X bit in the condition code. Because the XIRQ input is level sensitive, it can datashset connected. Most datasheets listed on this page may be downloaded as a single 6. Home – IC Supply – Link.
This pin is always an input and. Overview of the MC9S12A microcontroller.
This pin is always an input and can always be read. There is an active pull-up on this pin while in reset and immediately out of reset. Whenever XIRQ or IRQ are used with multiple interrupt sources IRQ must be configured for level-sensitive operation if datashee 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.
This manual describes the features datzsheet operation of the core central processing unit, or CPU, and development support functions used in all HCS12 microcontrollers. The pull-up can be turned off by clearing.
The state of these 68jc12 during reset determine the MCU operating mode. For a brief introduction to the microcontroller used, see the following:.
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.
Freescale 68HC12 – Wikipedia
There is an active pull-up on this pin while in reset. Mosaic Industries web site. Pre-coded C-language routines make it easy to access these features. Xatasheet following Freescale datasheets are provided to supplement the documentation on this website. The BKGD pin has an.
If the interrupt line is held low, the. The Module Mapping Control Guide shows you how datasheeet use the control registers for the HCS12 Microcontroller and how to configure the device’s 668hc12 map. MCU will recognize another interrupt as soon as the interrupt mask bit in. Even so, as a service to those looking for descriptions of the protocol, the datasheets are provided here: Using this Doc Web.
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.
As the user manual for its Enhanced Capture Time module provides some specifications that were neglected datzsheet the manual for the MC9S12DP version, it is provided here. Refer to Development Support. XIRQ is often used as a power loss detect interrupt.
The BKGD pin receives and transmits serial background debugging. The XIRQ input provides a means of requesting a nonmaskable interrupt. This page is about: