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Skip condition
Number of
cycles
Number of
words
Instruction
code
D9
D0
92
4554 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Flag CY
2
16
Skip condition
Number of
cycles
Number of
words
Instruction
code
D9
D0
Flag CY
2
16
Skip condition
Number of
cycles
Number of
words
Instruction
code
D9
D0
Flag CY
2
16
Skip condition
Number of
cycles
Number of
words
Instruction
code
D9
D0
Flag CY
2
16
SNZT4 (Skip if Non Zero condition of Timer 4 inerrupt request flag)
SNZT5 (Skip if Non Zero condition of Timer 5 inerrupt request flag)
SVDE (Set Voltage Detector Enable flag)
1010000011
283
11
–
V23 = 0: (T4F) = 1
Grouping:
Timer operation
Description: When V23 = 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 V23 = 1 : This instruction is equiva-
lent to the NOP instruction.
Operation:
V23 = 0: (T4F) = 1 ?
After skipping, (T4F)
← 0
V23 = 1: SNZT4 = NOP
(V23 = bit 3 of interrupt control register V2)
1010000100
284
11
–
V21 = 0: (T5F) = 1
Grouping:
Timer operation
Description: When V21 = 0 : Skips the next instruction
when timer 5 interrupt request flag T5F is
“1.” After skipping, clears (0) to the T5F
flag. When the T5F flag is “0,” executes the
next instruction.
When V21 = 1 : This instruction is equiva-
lent to the NOP instruction.
Operation:
V21 = 0: (T5F) = 1 ?
After skipping, (T5F)
← 0
V21 = 1: SNZT5 = NOP
(V21 = bit 1 of interrupt control register V2)
1010010011
293
11
–
Grouping:
Other operation
Description: Validates the voltage drop detection circuit
at power down (clock operating mode and
RAM back-up mode) when VDCE pin is “H”.
Operation:
At power down mode, voltage drop detection circuit valid
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
SNZT3 (Skip if Non Zero condition of Timer 3 interrupt request flag)
1010000010
282
11
–
V20 = 0: (T3F) = 1
Grouping:
Timer operation
Description: When V20 = 0 : Skips the next instruction
when timer 3 interrupt request flag T3F is
“1.” After skipping, clears (0) to the T3F
flag. When the T3F flag is “0,” executes the
next instruction.
When V20 = 1 : This instruction is equiva-
lent to the NOP instruction.
Operation:
V20 = 0: (T3F) = 1 ?
After skipping, (T3F)
← 0
V20 = 1: SNZT3 = NOP
(V20 = bit 0 of interrupt control register V2)