4509 Datasheet, PDF (96/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
SUPT (Set UPT flag)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0
0
0
1
0
1
1
0
0
1
2
0
5
9 ₁₆
1
1
–
Skip condition
–
Operation: (UPTF) ← 1
Grouping: Other operation
Description: Sets (1) to the high-order bit reference en-
able flag UPTF. When the table reference
instruction (TABP p) is executed, the high-
order 2 bits of ROM reference data is
transferred to the low-order 2 bits of regis-
ter D.
SVDE (Set Voltage Detector Enable flag)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
1
0
1
0
0
1
0
0
1
1
2
2
9
3 ₁₆
1
1
–
Skip condition
–
Operation: Voltage drop detection circuit valid at RAM back-up
Grouping: Other operation
Description: Validates the voltage drop detection circuit
at RAM back-up.
Note:
This instruction can be executed only for
the H version.
SZB j (Skip if Zero, Bit)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0 0 0 0 1 0 0 0 j j ₂ 0 2 j ₁₆
1
1
–
Skip condition
(Mj(DP)) = 0
j = 0 to 3
Operation:
(Mj(DP)) = 0 ?
j = 0 to 3
Grouping: Bit operation
Description: Skips the next instruction when the con-
tents of bit j (bit specified by the value j in
the immediate field) of M(DP) is “0.”
Executes the next instruction when the con-
tents of bit j of M(DP) is “1.”
SZC (Skip if Zero, Carry flag)
Instruction
code
D9
D0
Number of Number of Flag CY
0
0
0
0
1
0
1
1
1
1
0
2
2
F ₁₆
words
1
cycles
1
–
Skip condition
(CY) = 0
Operation: (CY) = 0 ?
Grouping: Arithmetic operation
Description: Skips the next instruction when the con-
tents of carry flag CY is “0.”
After skipping, the CY flag remains un-
changed.
Executes the next instruction when the con-
tents of the CY flag is “1.“
Rev.1.02 2006.12.22 page 96 of 140
REJ03B0147-0102