MC68HC08AZ32A Datasheet, PDF (378/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Keyboard Module (KBD)
21.6 Low-Power Modes
The WAIT and STOP instructions put the MCU in low-power-
consumption standby modes.
21.6.1 Wait Mode
The keyboard module remains active in wait mode. Clearing the
IMASKK bit in the keyboard status and control register enables keyboard
interrupt requests to bring the MCU out of wait mode.
21.6.2 Stop Mode
The keyboard module remains active in stop mode. Clearing the
IMASKK bit in the keyboard status and control register enables keyboard
interrupt requests to bring the MCU out of stop mode.
21.7 Keyboard Module During Break Interrupts
The BCFE bit in the break flag control register (BFCR) enables software
to clear status bits during the break state. See Break Module on page
149.
To allow software to clear the KEYF bit during a break interrupt, write a
logic 1 to the BCFE bit. If KEYF is cleared during the break state, it
remains cleared when the MCU exits the break state.
To protect the KEYF bit during the break state, write a logic 0 to the
BCFE bit. With BCFE at logic 0, writing to the keyboard acknowledge bit
(ACKK) in the keyboard status and control register during the break state
has no effect. See Keyboard Status and Control Register on page
379.
Technical Data
378
MC68HC08AZ32A — Rev 1.0
Keyboard Module (KBD)
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