
33
MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
Function
(A)
←
n
n = 0 to 15
(SP)
←
(SP) + 1
(SK(SP))
←
(PC)
(PC
H
)
←
p
(PC
L
)
←
(DR
2
–DR
0
,
A
3
–A
0
)
(B)
←
(ROM(PC))
7 to 4
(A)
←
(ROM(PC))
3 to 0
(PC)
←
(SK(SP))
(SP)
←
(SP) – 1
(A)
←
(A) + (M(DP))
(A)
←
(A) + (M(DP))
+ (CY)
(CY)
←
Carry
(A)
←
(A) + n
n = 0 to 15
(CY)
←
1
(CY)
←
0
(CY) = 0
(A)
←
(A)
→
CY
→
A
3
A
2
A
1
A
0
Logic operation
instruction
XOR, OR, AND
(Mj(DP))
←
1
j = 0 to 3
(Mj(DP))
←
0
j = 0 to 3
(Mj(DP)) = 0
j = 0 to 3
LIST OF INSTRUCTION FUNCTION
A
R
Grouping
Mnemonic
TAB
TBA
TAY
TYA
TEAB
TABE
TDA
LXY x, y
INY
DEY
TAM j
XAM j
XAMD j
XAMI j
Function
(A)
←
(B)
(B)
←
(A)
(A)
←
(Y)
(Y)
←
(A)
(E
7
–E
4
)
←
(B)
(E
3
–E
0
)
←
(A)
(B)
←
(E
7
–E
4
)
(A)
←
(E
3
–E
0
)
(DR
2
–DR
0
)
←
(A
2
–A
0
)
(X)
←
x, x = 0 to 3
(Y)
←
y, y = 0 to 15
(Y)
←
(Y) + 1
(Y)
←
(Y) – 1
(A)
←
(M(DP))
(X)
←
(X) EXOR(j)
j = 0 to 3
(A)
←→
(M(DP))
(X)
←
(X) EXOR(j)
j = 0 to 3
(A)
←→
(M(DP))
(X)
←
(X) EXOR(j)
j = 0 to 3
(Y)
←
(Y) – 1
(A)
←→
(M(DP))
(X)
←
(X) EXOR(j)
j = 0 to 3
(Y)
←
(Y) + 1
Grouping
Mnemonic
LA n
TABP p
AM
AMC
A n
SC
RC
SZC
CMA
RAR
LGOP
SB j
RB j
SZB j
R
R
B
C
o
Grouping
Mnemonic
SEAM
SEA n
B a
BL p, a
BA a
BLA p, a
BM a
BML p, a
BMLA p,
a
RTI
RT
RTS
Function
(A) = (M(DP))
(A) = n
n = 0 to 15
(PC
L
)
←
a
6
–a
0
(PC
H
)
←
p
(PC
L
)
←
a
6
–a
0
(PC
L
)
←
(a
6
–a
4
,
A
3
–
A
0
)
(PC
H
)
←
p
(PC
L
)
←
(a
6
–a
4
,
A
3
–
A
0
)
(SP)
←
(SP) + 1
(SK(SP))
←
(PC)
(PC
H
)
←
2
(PC
L
)
←
a
6
–a
0
(SP)
←
(SP) + 1
(SK(SP))
←
(PC)
(PC
H
)
←
p
(PC
L
)
←
a
6
–a
0
(SP)
←
(SP) + 1
(SK(SP))
←
(PC)
(PC
H
)
←
p
(PC
L
)
←
(a
6
–a
4
,
A
3
–
A
0
)
(PC)
←
(SK(SP))
(SP)
←
(SP) – 1
(PC)
←
(SK(SP))
(SP)
←
(SP) – 1
(PC)
←
(SK(SP))
(SP)
←
(SP) – 1
S
R
B