MC68HC05SU3A Datasheet, PDF (41/80 Pages) Freescale Semiconductor, Inc – Fully static chip design featuring the industry standard 8-bit M68HC05 core

Freescale Semiconductor, Inc.
The KBIE bit in the Miscellaneous Control Register controls the master enable for the keyboard
interrupts.
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Miscellaneous Control Register $0C KBIE KBIC INTO INTE LVRE SM IRQ2F IRQ2E 0001 0000
KBIE — KeyBoard Interrupt Enable
1 (set) – Keyboard interrupts master enabled.
0 (clear) – Keyboard interrupts master disabled.
KBIC — KeyBoard Interrupt Clear
5
This is a write-only bit and always read as “0”.
1 (set) – Writing a “1” clears the keyboard interrupt latch.
0 (clear) – Writing a “0” has no effect.
The Keyboard Interrupt Mask Register (KBIMR) masks individual keyboard interrupt pins and
setting of the internal pull-up resistors on port A.
KBIMR
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$0B KBE7 KBE6 KBE5 KBE4 KBE3 KBE2 KBE1 KBE0 0000 0000
KBEx — PAx Keyboard Interrupt Enable
1 (set)
– Keyboard interrupt enabled for PAx. A 20KΩ internal pull-up resistor
is connected. High to low transition on PAx will cause a keyboard
interrupt.
0 (clear) – Keyboard interrupt for PAx pin is masked. Any transitions on PAx will
not set any flags.
MC68HC05SU3A
RESETS AND INTERRUPTS
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TPG
5-9