mc68hc908lb8 Freescale Semiconductor, Inc, mc68hc908lb8 Datasheet - Page 85

• Manufacturer Part Number: mc68hc908lb8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 9
Keyboard Interrupt Module (KBI)
9.1 Introduction
The keyboard interrupt module (KBI) provides seven independently maskable external interrupts which
are accessible via PTA0–PTA6. When a port pin is enabled for keyboard interrupt function, an internal
pullup device is also enabled on the pin.
Freescale Semiconductor
Notes:
1. Pin contains integrated pullup device.
2. Fault function switchable between pins PTB2 and PTB7.
USER FLASH VECTOR SPACE — 34 BYTES
REGISTERS
V
V
ROUTINES ROM — 674 BYTES
CPU
DD
SS
MONITOR ROM — 350 BYTES
USER FLASH — 8 KBYTES
REGISTERS — 64 BYTES
USER RAM — 128 BYTES
CONTROL AND STATUS
FLASH PROGRAMMING
M68HC08 CPU
SYSTEM INTEGRATION
ARITHMETIC/LOGIC
Figure 9-1. Block Diagram Highlighting KBI Block and Pins
OSCILLATOR
MODULE
MODULE
UNIT (ALU)
POWER
MC68HC908LB8 Data Sheet, Rev. 1
8-BIT ANALOG-TO-DIGITAL
HIGH RESOLUTION PWM
COMPUTER OPERATING
KEYBOARD INTERRUPT
OP AMP/COMPARATOR
LOW-VOLTAGE INHIBIT
CONVERTER MODULE
DUAL CHANNEL PWM
PROPERLY MODULE
2-CHANNEL TIMER
INTERNAL BUS
MODULE
MODULE
MODULE
MODULE
MODULE
MODULE
PTA6
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
PTB7/V
PTB6/V–
PTB5/V+
PTB4/PWM1
PTB3/PWM0
PTB2/FAULT
PTB1/BOT
PTB0/TOP
PTC2
PTC1
PTC0
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
OUT
/AD5/TCH0/KBI6
/RST/KBI5
/AD4/KBI4
/AD3/KBI3
/AD2/KBI2
/AD1/KBI1
/AD0/KBI0
/SHTDWN/IRQ
/OSC2
/OSC1
/AD6/FAULT
(2)
(2)
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