4559 Datasheet, PDF (99/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4559 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
SEAM (Skip Equal, Accumulator with Memory)
Instruc-
tion
code
D9
D0
0 0 0 0 1 0 0 1 1 02 0 2
6 ₁₆
Number of
words
1
Number of
cycles
1
Flag CY
-
Skip condition
(A) = (M(DP))
Opera- (A) = (M(DP)) ?
tion:
Grouping: Comparison operation
Description: Skips the next instruction when the contents of register A is
equal to the contents of M(DP).
Executes the next instruction when the contents of register
A is not equal to the contents of M(DP).
SNZ0 (Skip if Non Zero condition of external interrupt 0 request flag)
Instruc-
Number of
tion
code
D9
D0
0 0 0 0 1 1 1 0 0 0 ₂ 0 3 8 ₁₆
words
1
Number of
cycles
1
Flag CY
-
Skip condition
V10 = 0 : (EXF0) = 1
Opera-
tion:
V10 = 0 : (EXF0) = 1 ?
(EXF0) ← 0
V10 = 1 : SNZ0 = NOP
(V10 : bit 0 of the interrupt control register V1)
Grouping: Interrupt operation
Description: When V10 = 0 : Clears (0) to the EXF0 flag and skips the
next instruction when external 0 interrupt request flag
EXF0 is “1”. When the EXF0 flag is “0”, executes the next
instruction.
When V10 = 1 : This instruction is equivalent to the NOP
instruction.
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 : (INT) = “L” ?
I12 = 1 : (INT) = “H” ?
(I12 : bit 2 of the interrupt control register I1)
A ₁₆
Number of Number of
words
cycles
Flag CY
Skip condition
1
1
-
I12 = 0 : (INT0) = “L”
I12 = 1 : (INT0) = “H”
Grouping: Interrupt operation
Description: When I12 = 0 : Skips the next instruction when the level of
INT pin is “L”. Executes the next instruction when the level
of INT pin is “H”.
When I12 = 1 : Skips the next instruction when the level of
INT pin is “H.” Executes the next instruction when the level
of INT 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”.
Rev.1.04 Aug 23, 2007 Page 99 of 146
REJ03B0188-0104