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455A датащи(PDF) 91 Page - Renesas Technology Corp

номер детали 455A
подробное описание детали  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  148 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

455A датащи(HTML) 91 Page - Renesas Technology Corp

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Rev.1.01
Feb 15, 2008
Page 91 of 146
REJ03B0224-0101
455A Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
DEY (DEcrement register Y)
Instruc-
tion
code
D9
D0
Number of
words
Number of
cycles
Flag CY
Skip condition
0
0
0
001
01
11 2 01 7 16
11
-
(Y) = 15
Opera-
tion:
(Y)
← (Y) −1
Grouping:
RAM addresses
Description: Subtracts 1 from the contents of register Y.
As a result of subtraction, when the contents of register Y
is 15, the next instruction is skipped. When the contents of
register Y is not 15, the next instruction is executed.
DI (Disable Interrupt)
Instruc-
tion
code
D9
D0
Number of
words
Number of
cycles
Flag CY
Skip condition
0
0
0
000
01
00 2 00 4 16
11
-
-
Opera-
tion:
(INTE)
← 0
Grouping:
Interrupt control operation
Description: Clears (0) to interrupt enable flag INTE, and disables the
interrupt.
Note:
Interrupt is disabled by executing the DI instruction after
executing 1 machine cycle.
DWDT (Disable WatchDog Timer)
Instruc-
tion
code
D9
D0
Number of
words
Number of
cycles
Flag CY
Skip condition
1
0
1
001
11
00 2 29 C 16
11
-
-
Opera-
tion:
Stop of watchdog timer function enabled
Grouping:
Other operation
Description: Stops the watchdog timer function by the WRST instruction
after executing the DWDT instruction.



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