SM8521 Datasheet, PDF (54/56 Pages) Sharp Electrionic Components – 8-Bit Single-Chip Microcomputer

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.
NAME
Table 5 Addressing Mode Summary
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
R = 0, 2, … 254
RR
(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
Register index
–(r)
n(r)^∗2
r = R0-R7
n = 00H-FFH, r = R1-R7
Memory (0000H-00FFH) [byte]
Memory (0000H-00FFH) [byte]
Register pair indirect @rr rr = RR0, RR2, … , RR14
Memory (0000H-FFFFH) [word/byte]
Register pair indirect
(rr)+ rr = RR0, RR2, … , RR14
auto increment
Memory (0000H-FFFFH) [word/byte]
Register pair indirect
–(rr) rr = RR0, RR2, … , RR14
auto decrement
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]
Register file (0000H-007FH) and memory
Bit
b
b = 0 to 7
(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
∗1 The data indicated by [
∗2 R0 can not be used.
∗3 RR0 can not be used.
@DA DA = 0000H-FFFFH
Memory (0000H-FFFFH)
] is the unit of possible to use in Load and Arithmetic Instructions.
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