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4559 Datasheet, PDF (119/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
4559 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
TW3A (Transfer data to register W3 from Accumulator)
Instruc-
tion
code
D9
D0
1 0 0 0 0 1 0 0 0 0 2 2 1 0 16
Number of
words
1
Number of
cycles
1
Flag CY
-
Skip condition
-
Opera- (W3) ← (A)
tion:
Grouping: Timer operation
Description: Transfers the contents of register A to timer control register
W3.
TW4A (Transfer data to register W4 from Accumulator)
Instruc-
tion
code
D9
D0
1 0 0 0 0 1 0 0 0 1 2 2 1 1 16
Number of
words
1
Number of
cycles
1
Flag CY
-
Skip condition
-
Opera- (W4) ← (A)
tion:
Grouping: Timer operation
Description: Transfers the contents of register A to timer control register
W4.
TYA (Transfer data to register Y from Accumulator)
Instruc-
tion
code
D9
D0
0 0 0 0 0 0 1 1 0 0 2 0 0 C 16
Number of
words
1
Number of
cycles
1
Flag CY
-
Skip condition
-
Opera- (Y) ← (A)
tion:
Grouping: Register to register transfer
Description: Transfers the contents of register A to register Y.
WRST (Watchdog timer ReSeT)
Instruc-
tion
code
D9
D0
1 0 1 0 1 0 0 0 0 0 2 2 A 0 16
Number of
words
1
Number of
cycles
1
Flag CY
-
Skip condition
(WDF1) = 1
Opera- (WDF1) = 1 ?
tion: (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”, executes the next instruction. Also, stops the
watchdog timer function when executing the WRST
instruction immediately after the DWDT instruction.
Rev.1.04 Aug 23, 2007 Page 119 of 146
REJ03B0188-0104