mc68hc908qb4 Freescale Semiconductor, Inc, mc68hc908qb4 Datasheet - Page 78

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

External Interrupt (IRQ)
When set, the IMASK bit in INTSCR masks the IRQ interrupt request. A latched interrupt request is not
presented to the interrupt priority logic unless IMASK is clear.
A falling edge on the IRQ pin can latch an interrupt request into the IRQ latch. An IRQ vector fetch,
software clear, or reset clears the IRQ latch.
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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
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
The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including the IRQ interrupt request.
Figure 8-1. Block Diagram Highlighting IRQ Block and Pin
V
V
DD
SS
MC68HC908QB8 Data Sheet, Rev. 2
NOTE
M68HC08 CPU
MC68HC908QB8
USER FLASH
8192 BYTES
DEVELOPMENT SUPPORT
KEYBOARD INTERRUPT
EXTERNAL INTERRUPT
INTERFACE MODULE
SERIAL PERIPHERAL
ENHANCED SERIAL
COMMUNICATIONS
4-CHANNEL 16-BIT
TIMER MODULE
AUTO WAKEUP
BREAK MODULE
LOW-VOLTAGE
Freescale Semiconductor
MONITOR ROM
GENERATOR
10-CHANNEL
INTERFACE
10-BIT ADC
MODULE
MODULE
MODULE
MODULE
CLOCK
INHIBIT
COP