4509 Datasheet, PDF (86/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 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 valid
Grouping: Other operation
Description: Makes the immediate after POF instruction
valid by executing the EPOF instruction.
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.1.02 2006.12.22 page 86 of 140
REJ03B0147-0102