MC6800 Datasheet, PDF (20/32 Pages) Motorola, Inc – 8-BIT MICROPROCESSING UNIT (MPU)

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FIGURE ~ – PROGRAM FLOW FOR INTERRUPTS
.-
Software lnterruDt
Main Program’
Wait For
Interrupt
Main Program
Hardware Interrupt or
NonMaskable Interrupt (NMI)
Main Program
n:=.
:1=
n-
7“^{Stack MPU}
Register Contents
Sp +
m—7
m—6
m—5
m—4
m—3
m—2
m—1
m
WI
FFF8
FFF9
Interrupt Memorv Assignment
FFF8 I
IRQ
I ^Ms
FFF9
IRQ
LS
FFFA
Swl
MS
FFFB
Swl
LS
#
e
NOTE: MS= Most Significant Address Bvte;
LS = Least S~nificant Address Byte;
MOTOROLA
@
First Instr.
Addr. Formed
BvFetching
2. Eytes From
Per, Mere,
Assign.
FFFC
FFFD
dSet Interrupt
Mask (CCR 4)
FFFE
FFFF
Load Interrupt
Vector Into
Program Counter
Q
f
A
I nterruo_,t_. Proaram
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