4501_M Datasheet, PDF (80/212 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES

4501 Group
HARDWARE
INSTRUCTIONS
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
INY (INcrement register Y)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0
0
0
0
0
1
0
0
1
1
0
2
1
3 ₁₆
1
1
–
Skip condition
(Y) = 0
Operation: (Y) ← (Y) + 1
Grouping:
Description:
RAM addresses
Adds 1 to the contents of register Y. As a re-
sult of addition, when the contents of register
Y is 0, the next instruction is skipped. When
the contents of register Y is not 0, the next
instruction is executed.
LA n (Load n in Accumulator)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0
0
0
1
1
1
n
n
n
n
0
2
7
n ₁₆
1
1
–
Skip condition
Continuous
description
Operation:
(A) ← n
n = 0 to 15
Grouping: Arithmetic operation
Description: Loads the value n in the immediate field to
register A.
When the LA instructions are continuously
coded and executed, only the first LA in-
struction is executed and other LA
instructions coded continuously are skipped.
LXY x, y (Load register X and Y with x and y)
Instruction
code
D9
D0
Number of Number of Flag CY
1 1 x3 x2 x1 x0 y3 y2 y1 y0 3 x y
words
cycles
2
16
1
1
–
Skip condition
Continuous
description
Operation:
(X) ← x x = 0 to 15
(Y) ← y y = 0 to 15
Grouping: RAM addresses
Description: Loads the value x in the immediate field to
register X, and the value y in the immediate
field to register Y. When the LXY instructions
are continuously coded and executed, only
the first LXY instruction is executed and
other LXY instructions coded continuously
are skipped.
LZ z (Load register Z with z)
Instruction
code
D9
D0
Number of Number of Flag CY
0
0
0
1
0
0
1
0
z1 z0 0
2
4
8
+z ₁₆
words
1
cycles
1
–
Skip condition
–
Operation: (Z) ← z z = 0 to 3
Grouping: RAM addresses
Description: Loads the value z in the immediate field to
register Z.
Rev.2.01 Feb 07, 2005
REJ09B0192-0201
1-68