MC6800 Datasheet, PDF (19/32 Pages) Motorola, Inc – 8-BIT MICROPROCESSING UNIT (MPU)

FIGURE 21 – PROGRAM FLOW FOR RTS
SP-m–2
H
m—2
m—1
(n+3)H
m—1
m
m+l
n
n+l
nt2
nt3
SH = Subr. Addr.
SL = Subr. Addr.
I
n+l
n+2
BLast Subr. Instr.
R TS
FLOW FOR RTI
Pc —
@
a^J
s“
Last Inter. I nstr.
RTI
(a) Before Execution
MOTOROLA
m—7
m—6
CCR
m—5
m—4
ACCB
ACCA
m—3
m—2
x~
XL
sp~
m—1
m
PCH
4
PCL
7E
Pc—
“+1 I Next Main I“str.
I
I Last S“br. Instr.
I
s“
(b) After Execution
Semiconductor Products Inc.
19