4502 Datasheet, PDF (71/116 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4502 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
RC (Reset Carry flag)
Instruction
code
D9
D0
Number of Number of Flag CY
0000000110
006
words
cycles
2
16
1
1
0
Skip condition
–
Operation: (CY) ← 0
Grouping: Arithmetic operation
Description: Clears (0) to carry flag CY.
RCP (Reset Port C)
Instruction
code
D9
D0
Number of Number of Flag CY
1010001100
28C
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (C) ← 0
Grouping: Input/Output operation
Description: Clears (0) to port C.
RD (Reset port D specified by register Y)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0
0
0
0
0
1
0
1
0
0
0
2
1
4 ₁₆
1
1
–
Skip condition
–
Operation:
(D(Y)) ← 0
However,
(Y) = 0 to 5
Grouping: Input/Output operation
Description: Clears (0) to a bit of port D specified by register Y.
Note:
Set 0 to 5 to register Y because port D is six
ports (D0–D5).
When values except above are set to regis-
ter Y, this instruction is equivalent to the
NOP instruction.
RT (ReTurn from subroutine)
Instruction
code
D9
D0
Number of Number of Flag CY
0001000100
044
words
cycles
2
16
1
2
–
Skip condition
–
Operation:
(PC) ← (SK(SP))
(SP) ← (SP) – 1
Grouping: Return operation
Description: Returns from subroutine to the routine
called the subroutine.
Rev.3.01 2005.02.02 page 71 of 112
REJ03B0105-0301