MC908QY8CDWE Datasheet, PDF (149/232 Pages) Freescale Semiconductor, Inc – Addendum to MC68HC908QB8, rev. 3

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