NEC PD750008 Manuale Utente
258
µPD750008 USER'S MANUAL
11.3 INSTRUCTION CODES OF EACH INSTRUCTION
(1) Explanations of the symbols for the instruction codes
I
n
: Immediate data for n4 or n8
D
n
: Immediate data for mem
B
n
: Immediate data for bit
N
n
: Immediate data for n or IExxx
T
n
: Immediate data for taddr x 1/2
A
n
: Immediate data for the address (2 to 16) relative to branch destination address minus one
S
n
: Immediate data for the one’s complement of the address (15 to 1) relative to the branch destination
address
reg
R
2
R
1
R
0
reg
0
0
0
A
0
0
1
X
0
1
0
L
0
1
1
H
1
0
0
E
1
0
1
D
1
1
0
C
1
1
1
B
reg1
rp'
P
2
P
1
P
0
reg-pair
0
0
0
XA
0
0
1
XA'
0
1
0
HL
0
1
1
HL'
1
0
0
DE
1
0
1
DE'
1
1
0
BC
1
1
1
BC'
rp'1
Q
2
Q
1
Q
0
addressing
0
0
1
@HL
0
1
0
@HL+
0
1
1
@HL–
1
0
0
@DE
1
0
1
@DL
@rpa
rp2
P
2
P
1
reg-pair
0
0
XA
0
1
HL
1
0
DE
1
1
BC
rp1
rp
N
5
N
2
N
1
0
0
0
0
0
1
1
1
0
0
1
0
0
1
0
0
1
1
0
1
1
1
0
0
N
0
0
0
0
0
1
0
1
0
IExxx
IEBT
IEW
IET1
IET0
IECSI
IE0
IE2
IE4
1
1
1
0
IE1
@rpa1