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Addressing Mode
15
1.10. Etc.
U-page Addressing Mode
upage
The operand becomes offset address in U-page(FF00h~FFFFh). The program is jumped to the specified
address in U-page.
OP CODE
upage
Example)
4F 35
PCALL 35H
Table CALL
n
The vector table of TCALL is determined by the upper 4bits of op code. The domain of TCALL vector is in
address FFC0
H
~FFDF
H
.
OP CODE
Example)
4A
TCALL 4
Op code ( 4F )
Operand ( 35 )
MEMORY
FF00
h
NEXT
FF35
h
FFFF
h
U Page
Op code ( 4A )
MEMORY
FF00
h
T/vector1 ( 25 )
FFFF
h
U Page
T/vector2 ( D1 )
FFD6
h
FFD7
h
NEXT
D125
h
1
0
0
0
A
h
Op code
reverse
PC
F
h
F
h
1
1
1
1
1
1
1
1
1
1
1
0
1
0
0
1
6
h
D
h