MC68HC08AZ16 Datasheet, PDF (321/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Keyboard Module (KB)
Keyboard module during break interrupts
The system integration module (SIM) controls whether the keyboard
interrupt latch can be cleared during the break state. The BCFE bit in the
SIM break flag control register (SBFCR) enables software to clear the
latch during the break state.
To allow software to clear the keyboard interrupt latch during a break
interrupt, write a logic one 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 zero to the BCFE
bit. With BCFE at logic zero (its default state), writing during the break
state to the keyboard acknowledge bit (ACKK) in the keyboard status
and control register has no effect. See Keyboard status and control
register (KBSCR) on page 318.
MC68HC08AZ32
320
Keyboard Module (KB)
8-kbd
MOTOROLA