4507_M Datasheet, PDF (99/216 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES

4507 Group
HARDWARE
INSTRUCTIONS
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
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 ?
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.
XAM j (eXchange Accumulator and Memory data)
Instruction D9
D0
Number of Number of Flag CY
code
101101j j j j
2 Dj
words
cycles
2
16
1
1
–
Skip condition
–
Operation:
(A) ←→ (M(DP))
(X) ← (X)EXOR(j)
j = 0 to 15
Grouping: RAM to register transfer
Description: After exchanging the contents of M(DP)
with the contents of register A, an exclusive
OR operation is performed between regis-
ter X and the value j in the immediate field,
and stores the result in register X.
XAMD j (eXchange Accumulator and Memory data and Decrement register Y and skip)
Instruction D9
D0
Number of Number of Flag CY
code
101111j j j j
2Fj
words
cycles
2
16
1
1
–
Skip condition
(Y) = 15
Operation:
(A) ←→ (M(DP))
(X) ← (X)EXOR(j)
j = 0 to 15
(Y) ← (Y) – 1
Grouping: RAM to register transfer
Description: After exchanging the contents of M(DP)
with the contents of register A, an exclusive
OR operation is performed between regis-
ter X and the value j in the immediate field,
and stores the result in register X.
Subtracts 1 from the contents of register Y.
As a result of subtraction, when the con-
tents of register Y is 15, the next instruction
is skipped. When the contents of register Y
is not 15, the next instruction is executed.
XAMI j (eXchange Accumulator and Memory data and Increment register Y and skip)
Instruction D9
D0
Number of Number of Flag CY
code
101110j j j j
2 Ej
words
cycles
2
16
1
1
–
Skip condition
(Y) = 0
Operation:
(A) ←→ (M(DP))
(X) ← (X)EXOR(j)
j = 0 to 15
(Y) ← (Y) + 1
Grouping: RAM to register transfer
Description: After exchanging the contents of M(DP)
with the contents of register A, an exclusive
OR operation is performed between regis-
ter X and the value j in the immediate field,
and stores the result in register X.
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.2.01 Feb 04, 2005
REJ09B0195-0201
1-87