XC68HC08KH12 Motorola, XC68HC08KH12 Datasheet - Page 231

• Manufacturer Part Number: XC68HC08KH12
• Description: MICROCONTROLLER
• Manufacturer: Motorola

15.5.3 Port-E Keyboard Interrupt Registers
15.5.3.1 Port-E Keyboard Status and Control Register
MC68HC(7)08KH12
MOTOROLA
—
Rev. 1.0
Figure 15-5. Port-E Keyboard Status and Control Register (KBESCR)
Address: $000E
An interrupt signal on an edge-triggered pin can be acknowledged
immediately after enabling the pin. An interrupt signal on an edge- and
level-triggered interrupt pin must be acknowledged after a delay that
depends on the external load.
Bits [7:4] — Not used
KEYEF — Port-E Keyboard Flag Bit
Reset:
Read:
Write:
4. Write to the ACKE bit in the keyboard status and control register
5. Clear the IMASKE bit.
•
•
•
•
These read-only bits always read as logic 0s.
This read-only bit is set when a keyboard interrupt is pending on
port-E. Reset clears the KEYEF bit.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
to clear any false interrupts.
Flags keyboard interrupt requests.
Acknowledges keyboard interrupt requests.
Masks keyboard interrupt requests.
Controls keyboard interrupt triggering sensitivity.
Bit 7
0
0
Keyboard Interrupt Module (KBI)
= Unimplemented
6
0
0
5
0
0
4
0
0
Port-E Keyboard Interrupt Block Diagram
KEYEF
3
0
Keyboard Interrupt Module (KBI)
ACKE
2
0
0
Advance Information
IMASKE
1
0
MODEE
Bit 0
0
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