mc68hc908ap8a Freescale Semiconductor, Inc, mc68hc908ap8a Datasheet - Page 275

• Manufacturer Part Number: mc68hc908ap8a
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 18
Keyboard Interrupt Module (KBI)
18.1 Introduction
The keyboard interrupt module (KBI) provides eight independently maskable external interrupts which are
accessible via PTD0–PTD7. When a port pin is enabled for keyboard interrupt function, an internal 30kΩ
pullup device is also enabled on the pin.
18.2 Features
Features of the keyboard interrupt module include the following:
18.3 I/O Pins
The eight keyboard interrupt pins are shared with standard port I/O pins. The full name of the KBI pins
are listed in
Freescale Semiconductor
$001A
$001B
Addr.
•
•
•
•
Eight keyboard interrupt pins with pullup devices
Separate keyboard interrupt enable bits and one keyboard interrupt mask
Programmable edge-only or edge- and level- interrupt sensitivity
Exit from low-lower modes
Keyboard Interrupt Enable
Generic Pin Name
Register Name
Table
and Control Register
KBI0–KBI7
Keyboard Status
KBI
18-1. The generic pin name appear in the text that follows.
(KBSCR)
Register
(KBIER)
Reset:
Reset:
Read:
Read:
Write:
Write:
Figure 18-1. KBI I/O Register Summary
MC68HC908AP A-Family Data Sheet, Rev. 3
Table 18-1. Pin Name Conventions
KBIE7
Bit 7
0
0
0
PTD0/KBI0–PTD7/KBI7
Full MCU Pin Name
= Unimplemented
KBIE6
6
0
0
0
KBIE5
5
0
0
0
KBIE4
4
0
0
0
Pin Selected for KBI Function by KBIEx
KBIE3
KEYF
3
0
0
KBIE0–KBIE7
Bit in KBIER
KBIE2
ACKK
2
0
0
0
IMASKK
KBIE1
1
0
0
MODEK
KBIE0
Bit 0
0
0
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