MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 183

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MOTOROLA
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
Address: $001A
Bits 7–4 — Not used
KEYF — Keyboard Flag Bit
ACKK — Keyboard Acknowledge Bit
IMASKK— Keyboard Interrupt Mask Bit
MODEK — Keyboard Triggering Sensitivity Bit
Reset:
Read:
Write:
Figure 14-3. Keyboard Status and Control Register (KBSCR)
These read-only bits always read as logic 0s.
This read-only bit is set when a keyboard interrupt is pending on
port A or auto wake-up. Reset clears the KEYF bit.
Writing a logic 1 to this write-only bit clears the keyboard interrupt
request on port A and auto wake-up logic. ACKK always reads as
logic 0. Reset clears ACKK.
Writing a logic 1 to this read/write bit prevents the output of the
keyboard interrupt mask from generating interrupt requests on port A
or auto wake-up. Reset clears the IMASKK bit.
This read/write bit controls the triggering sensitivity of the keyboard
interrupt pins on port A and auto wake-up. Reset clears MODEK.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
1 = Keyboard interrupt requests masked
0 = Keyboard interrupt requests not masked
1 = Keyboard interrupt requests on falling edges and low levels
0 = Keyboard interrupt requests on falling edges only
Bit 7
0
0
Keyboard Interrupt Module (KBI)
= Unimplemented
6
0
0
5
0
0
4
0
0
KEYF
3
0
Keyboard Interrupt Module (KBI)
ACKK
2
0
0
Functional Description
IMASKK
1
0
MODEK
Bit 0
0
183