4571 Datasheet, PDF (84/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4571 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
SNZI0 (Skip if Non Zero condition of external Interrupt 0 input pin)
Instruc-
tion
code
Opera-
tion:
D9
D0
0 0 0 0 1 1 1 0 1 02 0 3
I12 = 0 : (INT0) = “L” ?
I12 = 1 : (INT0) = “H” ?
(I12 : bit 2 of the interrupt control register I1)
A ₁₆
Number of
words
1
Number of
cycles
1
Flag CY
-
Skip condition
I12 = 0 : (INT0) = “L”
I12 = 1 : (INT0) = “H”
Grouping: Interrupt operation
Description: When I12 = 0 : Skips the next instruction when the level of
INT0 pin is “L”. Executes the next instruction when the
level of INT0 pin is “H”.
When I12 = 1 : Skips the next instruction when the level of
INT0 pin is “H.” Executes the next instruction when the
level of INT0 pin is “L”.
SNZI1 (Skip if Non Zero condition of external Interrupt 1 input pin)
Instruc-
tion
D9
D0
Number of Number of
words
cycles
Flag CY
Skip condition
code
0 0 0 0 1 1 1 0 1 1 ₂ 0 3 B ₁₆
1
1
-
I22 = 0 : (INT1) = “L”
I22 = 1 : (INT1) = “H”
Opera- I22 = 0 : (INT1) = “L” ?
Grouping: Interrupt operation
tion: I22 = 1 : (INT1) = “H” ?
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”.
SNZP (Skip if Non Zero condition of Power down flag)
Instruc-
tion
code
D9
D0
0 0 0 0 0 0 0 0 1 1 ₂ 0 0 3 ₁₆
Number of
words
1
Number of
cycles
1
Flag CY
-
Skip condition
(P) = 1
Opera- (P) = 1 ?
tion:
Grouping: Other operation
Description: Skips the next instruction when the P flag is “1”.
After skipping, the P flag remains unchanged.
Executes the next instruction when the P flag is “0”.
SNZT1 (Skip if Non Zero condition of Timer 1 interrupt request flag)
Instruc-
Number of
tion
code
D9
D0
1 0 1 0 0 0 0 0 0 0 ₂ 2 8 0 ₁₆
words
1
Number of
cycles
1
Flag CY
-
Skip condition
V12 = 0 : (T1F) = 1
Opera-
tion:
V12 = 0 : (T1F) = 1 ?
(T1F) ← 0
V12 = 1 : SNZT1 = NOP
(V12 = bit 2 of interrupt control register V1)
Grouping: Timer operation
Description: When V12 = 0 : Clears (0) to the T1F flag and skips the
next instruction when timer 1 interrupt request flag T1F is
“1”. When the T1F flag is “0,” executes the next instruction.
When V12 = 1 : This instruction is equivalent to the NOP
instruction.
Rev.1.02 May 25, 2007 Page 84 of 124
REJ03B0179-0102