4524 Datasheet, PDF (96/161 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4524 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
DI (Disable Interrupt)
Instruction
code
D9
D0
Number of Number of Flag CY
0000000100
004
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (INTE) ← 0
Grouping: Interrupt control operation
Description: Clears (0) to interrupt enable flag INTE, and
disables the interrupt.
Note:
Interrupt is disabled by executing the DI in-
struction after executing 1 machine cycle.
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.
Rev.2.00 Jul 27, 2004 page 96 of 159
REJ03B0091-0200Z