4552 Datasheet, PDF (86/145 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4552 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
OP2A (Output port P2 from Accumulator)
Instruction
code
D9
D0
Number of Number of Flag CY
1000100010
222
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (P2) ← (A)
Grouping: Input/Output operation
Description: Outputs the contents of register A to port
P2.
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
0000000010
002
words
cycles
2
16
1
1
–
Skip condition
–
Operation: Transition to clock operating mode
Grouping: Other operation
Description: Puts the system in clock operating mode 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.
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.
Rev.3.02 Dec 22, 2006 page 86 of 142
REJ03B0023-0302