4502 Datasheet, PDF (70/116 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4502 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
POF (Power OFf1)
Instruction
code
D9
D0
Number of Number of Flag CY
0000000010
002
words
cycles
2
16
1
1
–
Skip condition
–
Operation:
RAM back-up
However, voltage drop detection circuit valid
Grouping: Other operation
Description: Puts the system in RAM back-up state by
executing the POF instruction after execut-
ing the EPOF instruction.
However, the voltage drop detection circuit is valid.
Note:
If the EPOF instruction is not executed before
executing this instruction, this instruction is
equivalent to the NOP instruction.
POF2 (Power OFf2)
Instruction
code
D9
D0
Number of Number of Flag CY
0000001000
008
words
cycles
2
16
1
1
–
Skip condition
–
Operation: RAM back-up
Grouping: Other operation
Description: Puts the system in RAM back-up state by
executing the POF2 instruction after ex-
ecuting the EPOF instruction. Operations of
all functions are stopped.
Note:
If the EPOF instruction is not executed before
executing 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.3.01 2005.02.02 page 70 of 112
REJ03B0105-0301