4554 Datasheet, PDF (87/138 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4554 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 9
Grouping: Input/Output operation
Description: Clears (0) to a bit of port D specified by reg-
ister Y.
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.3.00 Aug 06, 2004 page 87 of 136
REJ03B0043-0300Z