4509 Datasheet, PDF (85/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
CMA (CoMplement of Accumulator)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0 0 0 0 0 1 1 1 0 0 ₂ 0 1 C ₁₆
1
1
–
Skip condition
–
Operation: (A) ← (A)
Grouping: Arithmetic operation
Description: Stores the one’s complement for register
A’s contents in register A.
CRCK (Clock select: Rc oscillation ClocK)
Instruction
code
D9
D0
Number of Number of Flag CY
1010011011
29B
words
cycles
2
16
1
1
–
Skip condition
–
Operation: RC oscillation circuit selected
Grouping: Other operation
Description: Selects the RC oscillation circuit for main
clock f(XIN).
DEY (DEcrement register Y)
Instruction
code
D9
D0
Number of Number of Flag CY
0000010111
017
words
cycles
2
16
1
1
–
Skip condition
(Y) = 15
Operation: (Y) ← (Y) – 1
Grouping: RAM addresses
Description: Subtracts 1 from the contents of register Y.
As a result of subtraction, when the con-
tents of register Y is 15, the next instruction
is skipped. When the contents of register Y
is not 15, the next instruction is executed.
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.
Rev.1.02 2006.12.22 page 85 of 140
REJ03B0147-0102