4552 Datasheet, PDF (83/145 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4552 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
EI (Enable Interrupt)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0
0
0
0
0
0
0
1
0
1
0
2
0
5 ₁₆
1
1
–
Skip condition
–
Operation: (INTE) ← 1
Grouping: Interrupt control operation
Description: Sets (1) to interrupt enable flag INTE, and
enables the interrupt.
Note:
Interrupt is enabled by executing the EI in-
struction after executing 1 machine cycle.
EPOF (Enable POF instruction)
Instruction
code
D9
D0
Number of Number of Flag CY
0001011011
05B
words
cycles
2
16
1
1
–
Skip condition
–
Operation: POF instruction, POF2 instruction valid
Grouping: Other operation
Description: Makes the immediate after POF instruction
or POF2 instruction valid by executing the
EPOF instruction.
IAP0 (Input Accumulator from port P0)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
1
0
0
1
1
0
0
0
0
0
2
2
6
0 ₁₆
1
1
–
Skip condition
–
Operation: (A) ← (P0)
Grouping: Input/Output operation
Description: Transfers the input of port P0 to register A.
IAP1 (Input Accumulator from port P1)
Instruction
code
D9
D0
Number of Number of Flag CY
1001100001
261
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (A) ← (P1)
Grouping: Input/Output operation
Description: Transfers the input of port P1 to register A.
Rev.3.02 Dec 22, 2006 page 83 of 142
REJ03B0023-0302