HC908JL8AD/D

AMENDMENTS TO MC68HC908JL8/D, REV. 2

Addendum to MC68HC908JL8 Technical Data

AMENDMENTS TO MC68HC908JL8/D, REV. 2

Keyboard Interrupt

Page 243, Figure 15-2. Keyboard Interrupt Block Diagram — Replace with

the following block diagram:

Computer Operating

Properly (COP)

Page 254, 16.8.2 Stop Mode — Replace the two paragraphs:

From:

Stop mode turns off the ICLK input to the COP if the STOP_ICLKDIS bit is set

in configuration register 2 (CONFIG2). Service the COP immediately before

entering or after exiting stop mode to ensure a full COP timeout period after

entering or exiting stop mode.

After reset, the STOP_ICLKDIS bit is clear by default and ICLK is enabled

during stop mode.

To:

Stop mode turns off the ICLK input to the COP and clears the COP prescaler.

Service the COP immediately before entering or after exiting stop mode to

ensure a full COP timeout period after entering or exiting stop mode.

To prevent inadvertently turning off the COP with a STOP instruction, a

configuration option is available that disables the STOP instruction. When the

STOP bit in the configuration register has the STOP instruction is disabled,

execution of a STOP instruction results in an illegal opcode reset.

KBIE0

KBIE7

.

.

.

DQ

CK

CLR

MODEK

IMASKK

KEYBOARD

INTERRUPT FF

VECTOR FETCH

DECODER

ACKK

INTERNAL BUS

RESET

KBI7

KBI0

SYNCHRONIZER

KEYF

KEYBOARD

INTERRUPT

REQUEST

TO PULLUP ENABLE

TO PULLUP ENABLE

NOTE:

To prevent false interrupts, user should use software

to debounce keyboard interrupt inputs.

Freescale Semiconductor, Inc.

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