mc68hc908qb4 Freescale Semiconductor, Inc, mc68hc908qb4 Datasheet - Page 84

• Manufacturer Part Number: mc68hc908qb4
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Keyboard Interrupt Module (KBI)
9.3.1.1 MODEK = 1
If the MODEK bit is set, the keyboard interrupt inputs are both edge and level sensitive. The KBIPx bit will
determine whether a edge sensitive pin detects rising or falling edges and on level sensitive pins whether
the pin detects low or high levels. With MODEK set, both of the following actions must occur to clear a
keyboard interrupt request:
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RST, IRQ: Pins have internal pull up device
All port pins have programmable pull up device
PTA[0:5]: Higher current sink and source capability
Return of all enabled keyboard interrupt inputs to a deasserted level. As long as any enabled
keyboard interrupt pin is asserted, the keyboard interrupt remains active.
PTA4/OSC2/AD2/KBI4
PTA5/OSC1/AD3/KBI5
PTA0/TCH0/AD0/KBI0
PTA1/TCH1/AD1/KBI1
PTA2/IRQ/KBI2/TCLK
PTB1/MOSI/AD5
PTB2/MISO/AD6
PTA3/RST/KBI3
PTB0/SCK/AD4
PTB4/RxD/AD8
PTB5/TxD/AD9
PTB3/SS/AD7
MC68HC908QB8
PTB6/TCH2
PTB7/TCH3
POWER SUPPLY
256 BYTES
USER RAM
Figure 9-1. Block Diagram Highlighting KBI Block and Pins
V
V
DD
SS
MC68HC908QB8 Data Sheet, Rev. 2
M68HC08 CPU
MC68HC908QB8
USER FLASH
8192 BYTES
DEVELOPMENT SUPPORT
KEYBOARD INTERRUPT
EXTERNAL INTERRUPT
INTERFACE MODULE
SERIAL PERIPHERAL
Freescale Semiconductor
ENHANCED SERIAL
COMMUNICATIONS
4-CHANNEL 16-BIT
TIMER MODULE
AUTO WAKEUP
LOW-VOLTAGE
BREAK MODULE
MONITOR ROM
GENERATOR
10-CHANNEL
INTERFACE
10-BIT ADC
MODULE
MODULE
MODULE
MODULE
CLOCK
INHIBIT
COP