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SM8521 Datasheet(PDF) 54 Page - Sharp Corporation

Part # SM8521
Description  8-Bit Single-Chip Microcomputer
PDF  56 Pages
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Manufacturer  SHARP [Sharp Corporation]
Direct Link  http://sharp-world.com/
Logo SHARP - Sharp Corporation

SM8521 Datasheet(HTML) 54 Page - Sharp Corporation

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SM8521
Addressing Mode
There are 23 types of addressing mode to perform
memory accessing in SM85CPU. The relationships
between the addressing modes and the operand
are shown in the following table 5.
Table 5
Addressing Mode Summary
NAME
SYMBOL
Range
Operand ∗1
Implied
To specify the carry(C) and interrupt enable
(I) in the instruction code.
Register
r
r = R0-R7
General register [byte]
Register pair
rr
r = RR0, RR2, … , RR14
General register [word]
Register file
R
R = 0 to 255 (R0-R15)
Register file (0000H-007FH) and (0080H-00FFH)
[byte]
Register file pair
RR
R = 0, 2, … 254
(RR0, RR2, … , RR14)
Register file (0000H-007FH) and (0080H-00FFH)
[byte]
Register indirect
@r
r = R0-R7
Memory (0000H-00FFH) [byte]
Register indirect
auto increment
(r)+
r = R0-R7
Memory (0000H-00FFH) [byte]
Register indirect
auto decrement
–(r)
r = R0-R7
Memory (0000H-00FFH) [byte]
Register index
n(r)∗2
n = 00H-FFH, r = R1-R7
Memory (0000H-00FFH) [byte]
Register pair indirect
@rr
rr = RR0, RR2, … , RR14
Memory (0000H-FFFFH) [word/byte]
Register pair indirect
auto increment
(rr)+
rr = RR0, RR2, … , RR14
Memory (0000H-FFFFH) [word/byte]
Register pair indirect
auto decrement
–(rr)
rr = RR0, RR2, … , RR14
Memory (0000H-FFFFH) [word/byte]
Register pair index
nn(rr)∗3
nn = 0000H-FFFFH
rr = RR2, RR4, … , RR14
Memory (0000H-FFFFH) [word/byte]
Index indirect
@nn(r)∗2
nn = 0000H-FFFFH
r = R1-R7
Memory (0000H-FFFFH) [word]
Immediate
IM
IM = 00H-FFH
The immediate data in the instruction code [byte]
Immediate long
IML
IML = 0000H-FFFFH
The immediate data in the instruction code [word]
Bit
b
b = 0 to 7
Register
file
(0000H-007FH)
and
memory
(0080H-00FFH, FF00H-FFFFH) [bit] (1 bit of 1 byte
pointed by R, n(r) and DAp)
Port
p
Register file (0010H-0017H) [byte]
Relative
RA
PC – 128 to PC + 127
Program memory (1000H-FFFFH)
Direct
DA
DA = 0000H-FFFFH
Memory (0000H-FFFFH) [byte]
Direct short
DAs
DAs = 1000H-1FFFH
Program memory (1000H-1FFFH)
Direct special page
DAp
DAp = FF00H-FFFFH
Program memory (FF00H-FFFFH) [byte]
Direct indirect
@DA
DA = 0000H-FFFFH
Memory (0000H-FFFFH)
∗1 The data indicated by [ ] is the unit of possible to use in Load and Arithmetic Instructions.
∗2 R0 can not be used.
∗3 RR0 can not be used.
- 54 -



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