MC6800 Motorola, MC6800 Datasheet - Page 18

• Manufacturer Part Number: MC6800
• Description: 8-BIT MICROPROCESSING UNIT (MPU)
• Manufacturer: Motorola

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FIGURE 19 – PROGRAM FLOW FOR JSR (~TENDEm,\
(a) Before
Ex%utton
“ + 1
n+ 2 I
(S formed
SH and SL)
* K = Signed
]
MOTOROLA
(a) Before
““s=
Next
tK
n+
from
“1
Main
2
= Offset*
Execution
7-Bit
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r
FIGURE 18 – PROGRAM FLOW FOR BSR
(b)
l“str.
SL=Sub,.
After
value
JS R
Execution
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,
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1
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sP—m
PC_n
SP~m–2
m—l
m+l
FIGURE 20 – PROGRAM FLOW FOR JSR (lNDWED)
n+l
“+2
K = 8-Bit
m—1
m+l
B
a
(a) Before
n+l
n+2
n
m
Next
K = Of fset”
JSR=AD
a
Main
U“sig”ed
7E
7A
Execution
l“str.
(n +2)H
Value
PC+
X.+K
m+l
m—1
“+1
“+2
m
“
“Contents
r
g
—
(b)
Next
1st S.br,
Afrer
K = Offset
JSR
(n+2)H
(n+2)L
of Index
Main
7E
7A
= AD
Execuxion
Instr.
l“str.
Register
1
1
-.