4509 Datasheet, PDF (87/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
IAP1 (Input Accumulator from port P1)
Instruction
code
D9
D0
Number of Number of Flag CY
1001100001
261
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (A) ← (P1)
Grouping: Input/Output operation
Description: Transfers the input of port P1 to register A.
IAP2 (Input Accumulator from port P2)
Instruction
code
D9
D0
Number of Number of Flag CY
1001100010
262
words
cycles
2
16
1
1
–
Skip condition
–
Operation:
(A1, A0) ← (P21, P20)
(A3, A2) ← 0
Grouping: Input/Output operation
Description: Transfers the input of port P2 to the low-or-
der 2 bits (A1, A0) of register A.
Note:
After this instruction is executed, “0” is
stored to the high-order 2 bits (A3, A2) of
register A.
IAP3 (Input Accumulator from port P3)
Instruction
code
D9
D0
Number of Number of Flag CY
1001100011
263
words
cycles
2
16
1
1
–
Skip condition
–
Operation:
(A1, A0) ← (P31, P30)
(A3, A2) ← 0
Grouping: Input/Output operation
Description: Transfers the input of port P3 to the low-or-
der 2 bits (A1, A0) of register A.
Note:
After this instruction is executed, “0” is
stored to the high-order 2 bits (A3, A2) of
register A.
INY (INcrement register Y)
Instruction
code
D9
D0
Number of Number of Flag CY
0000010011
013
words
cycles
2
16
1
1
–
Skip condition
(Y) = 0
Operation: (Y) ← (Y) + 1
Grouping: RAM addresses
Description: Adds 1 to the contents of register Y. As a re-
sult of addition, when the contents of
register Y is 0, the next instruction is
skipped. When the contents of register Y is
not 0, the next instruction is executed.
Rev.1.02 2006.12.22 page 87 of 140
REJ03B0147-0102