MC68HC708XL36 FREESCALE [Freescale Semiconductor, Inc], MC68HC708XL36 Datasheet - Page 326

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MC68HC708XL36

Manufacturer Part Number
MC68HC708XL36
Description
HCMOS Microcontroller Unit
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
KBI
Low-Power Modes
Wait Mode
Stop Mode
Keyboard Module During Break Interrupts
MC68HC708XL36
326
The WAIT and STOP instructions put the MCU in low-power-consump-
tion standby modes.
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.
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.
The BCFE bit in the break flag control register (BFCR) enables software
to clear status bits during the break state. (See
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
327.)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Keyboard Status and Control Register
KBI
Break Module
MOTOROLA
on page
on page
6-intkbd8_a

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