參數(shù)資料
型號: 4571
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述: 單芯片4位微機的CMOS
文件頁數(shù): 99/126頁
文件大小: 1627K
代理商: 4571
Rev.1.02
May 25, 2007
Page 74 of 124
REJ03B0179-0102
4571 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
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
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.
EI
(Enable Interrupt)
Instruc-
tion
code
D9
D0
Number of
words
Number of
cycles
Flag CY
Skip condition
0
000
01
01 2 00 5 16
11
-
Opera-
tion:
(INTE)
1
Grouping:
Interrupt control operation
Description: Sets (1) to interrupt enable flag INTE, and enables the
interrupt.
Note:
Interrupt is enabled by executing the EI instruction after
executing 1 machine cycle.
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