MC908QY8CDWE Datasheet, PDF (80/232 Pages) Freescale Semiconductor, Inc – Addendum to MC68HC908QB8, rev. 3

External Interrupt (IRQ)
PTA0/TCH0/AD0/KBI0
PTA1/TCH1/AD1/KBI1
PTA2/IRQ/KBI2/TCLK
PTA3/RST/KBI3
PTA4/OSC2/AD2/KBI4
PTA5/OSC1/AD3/KBI5
PTB0/SCK/AD4
PTB1/MOSI/AD5
PTB2/MISO/AD6
PTB3/SS/AD7
PTB4/RxD/AD8
PTB5/TxD/AD9
PTB6/TCH2
PTB7/TCH3
MC68HC908QB8
256 BYTES
USER RAM
M68HC08 CPU
MC68HC908QB8
8192 BYTES
USER FLASH
CLOCK
GENERATOR
KEYBOARD INTERRUPT
MODULE
EXTERNAL INTERRUPT
MODULE
AUTO WAKEUP
MODULE
LOW-VOLTAGE
INHIBIT
4-CHANNEL 16-BIT
TIMER MODULE
COP
MODULE
10-CHANNEL
10-BIT ADC
V_DD
POWER SUPPLY
V_SS
ENHANCED SERIAL
COMMUNICATIONS
INTERFACE MODULE
SERIAL PERIPHERAL
INTERFACE
DEVELOPMENT SUPPORT
MONITOR ROM
BREAK MODULE
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
Figure 8-1. Block Diagram Highlighting IRQ Block and Pin
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.
NOTE
The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including the IRQ interrupt request.
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.
MC68HC908QB8 Data Sheet, Rev. 3
78
Freescale Semiconductor