M68ICS08GR datasheet(180/408 Pages) FREESCALE

180 / 408 page

Keyboard Interrupt (KBI)

Technical Data

MC68HC908GR8 — Rev 4.0

180

Keyboard Interrupt (KBI)

MOTOROLA

13.6 Low-Power Modes

The WAIT and STOP instructions put the MCU in low power-

consumption standby modes.

13.6.1 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.

13.6.2 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.

13.7 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 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 (ACKK) in the keyboard status and control register

during the break state has no effect. See Keyboard Status and Control

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

M68ICS08GR датащи(PDF) 180 Page - Freescale Semiconductor, Inc