MC68HC908RF2 Datasheet, PDF (193/254 Pages) Motorola, Inc – HCMOS Microcontroller Unit

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
2
1
Bit 0
Read: IRQ1F
Write: R
0
KEYF
IMASKI MODEI
ACKI
R
0
IMASKK MODEK
ACKK
Reset: 0
0
0
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
MC68HC908RF2
MOTOROLA
Keyboard/External Interrupt Module (KBI)
Advance Information
193