4554 Group
MITSUBISHI MICROCOMPUTERS
91
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
Skip condition
Number of
cycles
Number of
words
Instruction
code
D9
D0
Flag CY
2
16
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
SNZP (Skip if Non Zero condition of Power down flag)
0000000011
003
11
–
(P) = 1
Grouping:
Other operation
Description: Skips the next instruction when the P flag is
“1”.
After skipping, the P flag remains un-
changed.
Executes the next instruction when the P
flag is “0.”
Operation:
(P) = 1 ?
SNZI1 (Skip if Non Zero condition of external 1 Interrupt input pin)
0000111011
03B
11
–
I22 = 0 : (INT1) = “L”
I22 = 1 : (INT1) = “H”
Grouping:
Interrupt operation
Description: When I22 = 0 : Skips the next instruction
when the level of INT1 pin is “L.” Executes
the next instruction when the level of INT1
pin is “H.”
When I22 = 1 : Skips the next instruction
when the level of INT1 pin is “H.” Executes
the next instruction when the level of INT1
pin is “L.”
Operation:
I22 = 0 : (INT1) = “L” ?
I22 = 1 : (INT1) = “H” ?
(I22 : bit 2 of the interrupt control register I2)
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
SNZT1 (Skip if Non Zero condition of Timer 1 interrupt request flag)
1010000000
280
11
–
V12 = 0: (T1F) = 1
Grouping:
Timer operation
Description: When V12 = 0 : Skips the next instruction
when timer 1 interrupt request flag T1F is
“1.” After skipping, clears (0) to the T1F
flag. When the T1F flag is “0,” executes the
next instruction.
When V12 = 1 : This instruction is equiva-
lent to the NOP instruction.
Operation:
V12 = 0: (T1F) = 1 ?
After skipping, (T1F)
← 0
V12 = 1: SNZT1 = NOP
(V12 = bit 2 of interrupt control register V1)
SNZT2 (Skip if Non Zero condition of Timer 2 interrupt request flag)
1010000001
281
11
–
V13 = 0: (T2F) = 1
Grouping:
Timer operation
Description: When V13 = 0 : Skips the next instruction
when timer 2 interrupt request flag T2F is
“1.” After skipping, clears (0) to the T2F
flag. When the T2F flag is “0,” executes the
next instruction.
When V13 = 1 : This instruction is equiva-
lent to the NOP instruction.
Operation:
V13 = 0: (T2F) = 1 ?
After skipping, (T2F)
← 0
V13 = 1: SNZT2 = NOP
(V13 = bit 3 of interrupt control register V1)