4554 Datasheet, PDF (85/138 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4554 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
OP0A (Output port P0 from Accumulator)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
1
0
0
0
1
0
0
0
0
0
2
2
2
0 ₁₆
1
1
–
Skip condition
–
Operation: (P0) ← (A)
Grouping: Input/Output operation
Description: Outputs the contents of register A to port
P0.
OP1A (Output port P1 from Accumulator)
Instruction
code
D9
D0
Number of Number of Flag CY
1000100001
221
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (P1) ← (A)
Grouping: Input/Output operation
Description: Outputs the contents of register A to port
P1.
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 OFf1)
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 state by
executing the POF instruction after execut-
ing the EPOF instruction.
Note:
If the EPOF instruction is not executed before
executing this instruction, this instruction is
equivalent to the NOP instruction.
Rev.3.00 Aug 06, 2004 page 85 of 136
REJ03B0043-0300Z