4501_M Datasheet, PDF (78/212 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES

4501 Group
HARDWARE
INSTRUCTIONS
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:
Description:
Note:
Interrupt control operation
Clears (0) to interrupt enable flag INTE, and
disables the interrupt.
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:
Description:
Other operation
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:
Description:
Note:
Interrupt control operation
Sets (1) to interrupt enable flag INTE, and
enables the interrupt.
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:
Description:
Other operation
Makes the immediate after POF or POF2 in-
struction valid by executing the EPOF
instruction.
Rev.2.01 Feb 07, 2005
REJ09B0192-0201
1-66