4509 Datasheet, PDF (90/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
OR (logical OR between accumulator and memory)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0 0 0 0 0 1 1 0 0 1 ₂ 0 1 9 ₁₆
1
1
–
Skip condition
–
Operation: (A) ← (A) OR (M(DP))
Grouping: Arithmetic operation
Description: Takes the OR operation between the con-
tents of register A and the contents of
M(DP), and stores the result in register A.
POF (Power OFF)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0 0 0 0 0 0 0 0 1 0 ₂ 0 0 2 ₁₆
1
1
–
Skip condition
–
Operation: RAM back-up
Grouping: Other operation
Description: Puts the system in RAM back-up state by ex-
ecuting the POF instruction after executing
the EPOF instruction.
Note:
If the EPOF instruction is not executed just
before this instruction, this instruction is
equivalent to the NOP instruction.
RAR (Rotate Accumulator Right)
Instruction
code
D9
D0
Number of Number of Flag CY
0000011101
01D
words
cycles
2
16
1
1
0/1
Skip condition
–
Operation:
→ CY → A3A2A1A0
Grouping: Arithmetic operation
Description: Rotates 1 bit of the contents of register A in-
cluding the contents of carry flag CY to the
right.
RB j (Reset Bit)
Instruction
code
D9
D0
Number of Number of Flag CY
00010011j
j
0
2
4
C
+j ₁₆
words
1
cycles
1
–
Skip condition
–
Operation:
(Mj(DP)) ← 0
j = 0 to 3
Grouping: Bit operation
Description: Clears (0) the contents of bit j (bit specified
by the value j in the immediate field) of
M(DP).
Rev.1.02 2006.12.22 page 90 of 140
REJ03B0147-0102