4509 Datasheet, PDF (114/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
TW5A (Transfer data to register W5 from Accumulator)
Instruction D9
D0
code
1000010010
21
2
2
16
Number of
words
1
Number of Flag CY
cycles
1
–
Skip condition
–
Operation: (W5) ← (A)
Grouping: Timer operation
Description: Transfers the contents of register A to timer
control register W5.
TW6A (Transfer data to register W6 from Accumulator)
Instruction D9
D0
code
1 0 0 0 0 1 0 0 1 1₂ 2 1
3 ₁₆
Number of
words
1
Number of Flag CY
cycles
1
–
Skip condition
–
Operation: (W6) ← (A)
Grouping: Timer operation
Description: Transfers the contents of register A to timer
control register W6.
TYA (Transfer data to register Y from Accumulator)
Instruction
code
D9
D0
Number of Number of Flag CY
0000001100
00C
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (Y) ← (A)
Grouping: Register to register transfer
Description: Transfers the contents of register A to regis-
ter Y.
WRST (Watchdog timer ReSeT)
Instruction
code
D9
D0
Number of Number of Flag CY
1010100000
2 A0
words
cycles
2
16
1
1
–
Skip condition
(WDF1) = 1
Operation:
(WDF1) = 1 ?
(WDF1) ← 0
Grouping: Other operation
Description: Clears (0) to the WDF1 flag and skips the
next instruction when watchdog timer flag
WDF1 is “1.” When the WDF1 flag is “0,” ex-
ecutes the next instruction. Also, stops the
watchdog timer function when executing the
WRST instruction immediately after the
DWDT instruction.
Rev.1.02 2006.12.22 page 114 of 140
REJ03B0147-0102