4501_M Datasheet, PDF (100/212 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES

4501 Group
HARDWARE
INSTRUCTIONS
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
TW2A (Transfer data to register W2 from Accumulator)
Instruction D9
D0
code
1 0 0 0 0 0 1 1 1 1₂ 2 0
F ₁₆
Number of
words
1
Number of Flag CY
cycles
1
–
Skip condition
–
Operation: (W2) ← (A)
Grouping: Timer operation
Description: Transfers the contents of register A to timer
control register W2.
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
words
cycles
0 0 0 0 0 0 1 1 0 0 ₂ 0 0 C 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
words
cycles
1
0
1
0
1
0
0
0
0
0
2
2
A
0 ₁₆
1
1
–
Skip condition
(WDF1) = 1
Operation:
(WDF1) = 1 ?
After skipping, (WDF1) ← 0
Grouping: Other operation
Description: Skips the next instruction when watchdog
timer flag WDF1 is “1.” After skipping, clears
(0) to the WDF1 flag. When the WDF1 flag
is “0,” executes the next instruction. Also,
stops the watchdog timer function when ex-
ecuting the WRST instruction immediately
after the DWDT instruction.
Rev.2.01 Feb 07, 2005
REJ09B0192-0201
1-88