4501_M Datasheet, PDF (77/212 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES

4501 Group
HARDWARE
INSTRUCTIONS
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.
CMCK (Clock select: ceraMic resonance ClocK)
Instruction
code
D9
D0
Number of Number of Flag CY
1010011010
29A
words
cycles
2
16
1
1
–
Skip condition
–
Operation: Ceramic resonance circuit selected
Grouping: Other operation
Description: Selects the ceramic resonance circuit and
stops the on-chip oscillator.
CRCK (Clock select: Rc resonance ClocK)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
1
0
1
0
0
1
1
0
1
1
2
2
9
B ₁₆
1
1
–
Skip condition
–
Operation: RC resonance circuit selected
Grouping: Other operation
Description: Selects the RC resonance circuit and stops
the on-chip oscillator.
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:
Description:
RAM addresses
Subtracts 1 from the contents of register Y.
As a result of subtraction, when the contents
of register Y is 15, the next instruction is
skipped. When the contents of register Y is
not 15, the next instruction is executed.
Rev.2.01 Feb 07, 2005
REJ09B0192-0201
1-65