4554 Datasheet, PDF (82/138 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4554 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
DWDT (Disable WatchDog Timer)
Instruction
code
D9
D0
Number of Number of Flag CY
1010011100
29C
words
cycles
2
16
1
1
–
Skip condition
–
Operation: Stop of watchdog timer function enabled
Grouping: Other operation
Description: Stops the watchdog timer function by the
WRST instruction after executing the
DWDT instruction.
EI (Enable Interrupt)
Instruction
code
D9
D0
Number of Number of Flag CY
0000000101
005
words
cycles
2
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 or POF2
instruction valid by executing the EPOF in-
struction.
IAP0 (Input Accumulator from port P0)
Instruction
code
D9
D0
Number of Number of Flag CY
1001100000
260
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (A) ← (P0)
Grouping: Input/Output operation
Description: Transfers the input of port P0 to register A.
Rev.3.00 Aug 06, 2004 page 82 of 136
REJ03B0043-0300Z