Datasheet

Exception Control
MC68HC908QB8 Data Sheet, Rev. 3
Freescale Semiconductor 147
Figure 14-8
. Interrupt Entry
Figure 14-9. Interrupt Recovery
Figure 14-10
. Interrupt Recognition Example
MODULE
DATA BUS
R/W
INTERRUPT
DUMMY
SP SP – 1 SP – 2 SP – 3 SP – 4 VECT H VECT L START ADDR
ADDRESS BUS
DUMMY PC – 1[7:0] PC – 1[15:8] X A CCR V DATA H V DATA L OPCODE
I BIT
MODULE
DATA BUS
R/W
INTERRUPT
SP – 4 SP – 3 SP – 2 SP – 1 SP PC PC + 1
ADDRESS BUS
CCR A X PC – 1[7:0] PC – 1[15:8] OPCODE OPERAND
I BIT
CLI
LDA
INT1
PULH
RTI
INT2
BACKGROUND ROUTINE#$FF
PSHH
INT1 INTERRUPT SERVICE ROUTINE
PULH
RTI
PSHH
INT2 INTERRUPT SERVICE ROUTINE