4554 Datasheet, PDF (86/138 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4554 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
POF2 (Power OFf2)
Instruction
code
D9
D0
Number of Number of Flag CY
0000001000
008
words
cycles
2
16
1
1
–
Skip condition
–
Operation: Transition to RAM back-up mode
Grouping: Other operation
Description: Puts the system in RAM back-up state by
executing the POF2 instruction after ex-
ecuting the EPOF instruction.
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
words
cycles
0
0
0
0
0
1
1
1
0
1
0
2
1
D 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).
RBK (Reset Bank flag)
Instruction
code
D9
D0
Number of Number of Flag CY
0001000000
040
words
cycles
2
16
1
1
–
Skip condition
–
Operation: When TABP p instruction is executed, P6 ← 0
Grouping: Other operation
Description: Sets referring data area to pages 0 to 63
when the TABP p instruction is executed.
Note: This instruction cannot be used in M34554M8.
Rev.3.00 Aug 06, 2004 page 86 of 136
REJ03B0043-0300Z