Freescale Semiconductor MC68HC08KH12 Manual do Utilizador Página 240

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Advance Information MC68HC(7)08KH12Rev. 1.1
240 Freescale Semiconductor
the break flag control register (BFCR) enables software to clear status
bits during the break state.
To allow software to clear the keyboard interrupt latch during a break
interrupt, write a logic 1 to the BCFE bit. If a latch is cleared during the
break state, it remains cleared when the MCU exits the break state.
To protect the latch during the break state, write a logic 0 to the BCFE
bit. With BCFE at logic 0 (its default state), writing to the keyboard
acknowledge bit (ACKx) in the keyboard status and control register
during the break state has no effect.
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