MC68HC08AB16A Datasheet, PDF (338/380 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Keyboard Interrupt Module (KBI)
19.3 Features
Features of the keyboard interrupt module include the following:
• Five keyboard interrupt pins with pullup devices
• Separate keyboard interrupt enable bits and one keyboard
interrupt mask
• Built-in pull-up device if input pin is configured as input port bit
• Programmable edge-only or edge- and level- interrupt sensitivity
• Exit from low-power modes
Addr. Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
0
KEYF
0
Keyboard Status
IMASKK MODEK
$001B
and Control Register Write:
ACKK
(KBSCR)
Reset: 0
0
0
0
0
0
0
0
Read: 0
0
0
$0021
Keyboard Interrupt Enable
Register (KBIER)
Write:
KBIE4 KBIE3 KBIE2 KBIE1 KBIE0
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 19-1. KBI I/O Register Summary
19.4 I/O Pins
The five keyboard interrupt pins are shared with standard port I/O pins.
The full name of the KBI pins are listed in Table 19-1. The generic pin
name appear in the text that follows.
KBI
Generic Pin Name
KBD0
KBD1
KBD2
KBD3
KBD4
Table 19-1. Pin Name Conventions
Full MCU Pin Name
PTG0/KBD0
PTG1/KBD1
PTG2/KBD2
PTH0/KBD3
PTH1/KBD4
Pin Selected for KBI Function by
KBIEx Bit in KBIER
KBIE0
KBIE1
KBIE2
KBIE3
KBIE4
Technical Data
338
MC68HC08AB16A — Rev. 2.0
Keyboard Interrupt Module (KBI)
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