MC68HC908LD60IFU Freescale Semiconductor, MC68HC908LD60IFU Datasheet - Page 259

• Manufacturer Part Number: MC68HC908LD60IFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908LD60IFU

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 6MHz
• Program Memory Type: Flash
• Program Memory Size: 60KB
• Total Internal Ram Size: 1KB
• # I/os (max): 39
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• On-chip Adc: 6-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Compliant

19.5 Functional Description
MC68HC908LD60
Freescale Semiconductor
KBI0
KBI7
TO PULLUP ENABLE
TO PULLUP ENABLE
KBIE0
KBIE7
—
.
.
.
Rev. 1.1
Figure 19-2. Keyboard Interrupt Module Block Diagram
Writing to the KBIE7–KBIE0 bits in the keyboard interrupt enable register
independently enables or disables each port A pin as a keyboard
interrupt pin. Enabling a keyboard interrupt pin also enables its internal
pullup device. A logic 0 applied to an enabled keyboard interrupt pin
latches a keyboard interrupt request.
A keyboard interrupt is latched when one or more keyboard pins goes
low after all were high. The MODEK bit in the keyboard status and
control register controls the triggering mode of the keyboard interrupt.
If the MODEK bit is set, the keyboard interrupt pins are both falling edge-
and low level-sensitive, and both of the following actions must occur to
clear a keyboard interrupt request:
•
•
If the keyboard interrupt is edge-sensitive only, a falling edge on a
keyboard pin does not latch an interrupt request if another
keyboard pin is already low. To prevent losing an interrupt request
on one pin because another pin is still low, software can disable
the latter pin while it is low.
If the keyboard interrupt is falling edge- and low level-sensitive, an
interrupt request is present as long as any keyboard pin is low.
Keyboard Interrupt Module (KBI)
MODEK
V
DD
D
CK
CLR
Q
INTERRUPT FF
KEYBOARD
RESET
ACKK
VECTOR FETCH
Keyboard Interrupt Module (KBI)
INTERNAL BUS
DECODER
IMASKK
SYNCHRONIZER
Functional Description
Technical Data
KEYF
Keyboard
Interrupt
Request
259