4509 Datasheet, PDF (92/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
RTS (ReTurn from subroutine and Skip)
Instruction
code
D9
D0
Number of Number of Flag CY Skip condition
0001000101
045
2
16
words
1
cycles
2
–
Skip at uncondition
Operation:
(PC) ← (SK(SP))
(SP) ← (SP) – 1
Grouping: Return operation
Description: Returns from subroutine to the routine
called the subroutine, and skips the next in-
struction at uncondition.
RUPT (Reset UPT flag)
Instruction
code
D9
D0
Number of Number of Flag CY
0001011000
058
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (UPTF) ← 0
Grouping: Other operation
Description: Clears (0) to the high-order bit reference
enable flag UPTF.
SB j (Set Bit)
Instruction
code
D9
D0
Number of Number of Flag CY
00010111j
j
0
2
5
C
+j ₁₆
words
1
cycles
1
–
Skip condition
–
Operation:
(Mj(DP)) ← 0
j = 0 to 3
Grouping: Bit operation
Description: Sets (1) the contents of bit j (bit specified by
the value j in the immediate field) of M(DP).
SC (Set Carry flag)
Instruction
code
D9
D0
Number of Number of Flag CY
0000000111
007
words
cycles
2
16
1
1
1
Skip condition
–
Operation: (CY) ← 1
Grouping: Arithmetic operation
Description: Sets (1) to carry flag CY.
Rev.1.02 2006.12.22 page 92 of 140
REJ03B0147-0102