mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 234

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Keyboard Interrupt Module (KBI)
Technical Data
234
Address: $0016
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 14-2. 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. Reset
clears the KEYF bit.
Writing a logic 1 to this write-only bit clears the keyboard interrupt
request. 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. Reset
clears the IMASKK bit.
This read/write bit controls the triggering sensitivity of the keyboard
interrupt pins. 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
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
5
0
0
4
0
0
KEYF
3
0
ACKK
Freescale Semiconductor
0
2
0
IMASKK
1
0
MODEK
Bit 0
0