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The XIRQ input provides a means of requesting a nonmaskable interrupt.
During reset, the X bit in the condition code. Because the XIRQ input is level sensitive, it can be connected.
This pin is always an input and. There is an active pull-up on this pin while in reset. The pull-up can be turned off by clearing.
68HC12 Datasheet, PDF – Alldatasheet
XIRQ is often used as a power loss detect. If the interrupt line is held low, the. MCU will recognize another interrupt as soon as the interrupt mask bit in. The state of these pins during reset determine the MCU operating mode.
MODB datasbeet active pull-downs during reset. The BKGD pin receives and transmits serial background debugging.
A special self-timing protocol is used. The BKGD pin has an.
SGS Thomson Microelectronics – datasheet pdf
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. XIRQ is often used as a power loss detect interrupt. Whenever XIRQ or IRQ are used with multiple interrupt sources IRQ must be dataaheet 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. If the daatasheet 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.
Refer to Development Support. Home – IC Supply – Link.