mc908jl16 Freescale Semiconductor, Inc, mc908jl16 Datasheet - Page 155

• Manufacturer Part Number: mc908jl16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 12
Keyboard Interrupt Module (KBI)
12.1 Introduction
The keyboard interrupt module (KBI) provides eight independently maskable external interrupts which are
accessible via PTA0–PTA7. When a port pin is enabled for keyboard interrupt function, an internal pull-up
device is also enabled on the pin.
12.2 Features
Features of the keyboard interrupt module include the following:
12.3 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.
1. PTA6/KBI6 is only available when OSCSEL=0 at $FFD0 (RC option), and PTA6EN=1 at $000D.
•
•
•
•
KBI Generic Pin Name
Eight keyboard interrupt pins with pull-up devices
Separate keyboard interrupt enable bits and one keyboard interrupt mask
Programmable edge-only or edge- and level- interrupt sensitivity
Exit from low-power modes
Register Name
KBI0–KBI5
Keyboard Status and
Table
Keyboard Interrupt
KBI6
KBI7
Control Register
Enable Register
12-1. The generic pin name appear in the text that follows.
(KBSCR)
(KBIER)
Reset:
Reset:
Read:
Read:
Write:
Write:
Figure 12-1. KBI I/O Register Summary
Table 12-1. Pin Name Conventions
KBIE7
Bit 7
MC68HC908JL16 Data Sheet, Rev. 1.1
OSC2/RCCLK/PTA6/KBI6
0
0
0
PTA0/KBI0–PTA5/KBI5
Full MCU Pin Name
PTA7/KBI7
KBIE6
= Unimplemented
6
0
0
0
KBIE5
5
0
0
0
(1)
KBIE4
4
0
0
0
KBIE3
KEYF
Pin Selected for KBI Function
3
0
0
by KBIEx Bit in KBIER
KBIE0–KBIE5
KBIE2
ACKK
2
0
0
0
KBIE6
KBIE7
IMASKK
KBIE1
1
0
0
MODEK
KBIE0
Bit 0
0
0
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