4518 Datasheet, PDF (106/160 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4518 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
SNZT4 (Skip if Non Zero condition of Timer 4 inerrupt request flag)
Instruction
code
D9
D0
Number of
1
0
1
0
0
0
0
0
1
1
2
2
8
3 ₁₆
words
1
Number of
cycles
1
Flag CY
–
Skip condition
V21 = 0: (T4F) = 1
Operation:
V21 = 0: (T4F) = 1 ?
After skipping, (T4F) ← 0
V21 = 1: SNZT4 = NOP
(V21 = bit 1 of interrupt control register V2)
Grouping: Timer operation
Description: When V21 = 0 : Skips the next instruction
when timer 4 interrupt request flag T4F is
“1.” After skipping, clears (0) to the T4F
flag. When the T4F flag is “0,” executes the
next instruction.
When V21 = 1 : This instruction is equiva-
lent to the NOP instruction.
SRST (System ReSeT)
Instruction
code
D9
D0
Number of Number of Flag CY
words
cycles
0
0
0
0
0
0
0
0
0
1
0
2
0
1 ₁₆
1
1
–
Skip condition
–
Operation: System reset occurrence
Grouping: Other operation
Description: System reset occurs.
SST (Serial i/o transmission/reception STart)
Instruction
code
D9
D0
Number of Number of Flag CY
1010011110
29E
words
cycles
2
16
1
1
–
Skip condition
–
Operation:
(SIOF) ← 0
Serial I/O transmission/reception start
Grouping: Serial I/O operation
Description: Clears (0) to SIOF flag and starts serial I/O.
SZB j (Skip if Zero, Bit)
Instruction D9
code
00001000j
Operation:
(Mj(DP)) = 0 ?
j = 0 to 3
D0
Number of Number of Flag CY
j
0
2
2
j
16
words
1
cycles
1
–
Skip condition
(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.”
Rev.3.01 2005.06.15 page 106 of 157
REJ03B0008-0301