Freescale Semiconductor, Inc.
Keyboard/External Interrupt Module (KBI)
I/O Registers
14.6 I/O Registers
These registers control and monitor operation of the keyboard/external
interrupt module:
•
•
IRQ and keyboard status and control register, INTKBSCR
Keyboard interrupt enable register, KBIER
14.6.1 IRQ and Keyboard Status and Control Register
The IRQ and keyboard status and control register (INTKBSCR) controls
and monitors operation of the keyboard/external interrupt module. The
INTKBSCR has these functions:
•
•
•
•
•
•
•
Flags the keyboard interrupt requests
Acknowledges the keyboard interrupt requests
Masks the keyboard interrupt requests
Shows the state of the IRQ1 interrupt flag
Clears the IRQ1 interrupt latch
Masks the IRQ1 interrupt request
Controls the triggering sensitivity of the keyboard and IRQ1
interrupt pins
Address: $001A
Bit 7
6
5
4
3
KEYF
R
2
1
Bit 0
Read: IRQ1F
0
0
ACKK
0
IMASKI MODEI
IMASKK MODEK
Write:
R
0
ACKI
0
Reset:
0
0
0
0
0
R
= Reserved
Figure 14-5. IRQ and Keyboard Status and Control Register
(INTKBSCR)
IRQ1F — IRQ1 Flag Bit
This read-only status bit is high when the IRQ1 interrupt is pending.
1 = IRQ1 interrupt pending
0 = IRQ1 interrupt not pending
MC68HC908RFRK2
MOTOROLA
AdvanceInformation
Keyboard/External Interrupt Module (KBI)
193
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