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STC89LE53RC bảng dữ liệu(PDF) 18 Page - STCmicro Technology Co,.Ltd

tên linh kiện STC89LE53RC
Giải thích chi tiết về linh kiện  Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle
PDF  165 Pages
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nhà sản xuất  STC [STCmicro Technology Co,.Ltd]
Trang chủ  http://www.stcmicro.com/
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WDT overflow time is shown as the bellowed table when SYSclk=12MHz and MCU in 12T mode:
PS2
PS1
PS0
Pre-scale
WDT overflow Time @12MHz
and 12T mode
0
0
0
2
65.5 mS
0
0
1
4
131.0 mS
0
1
0
8
262.1 mS
0
1
1
16
524.2 mS
1
0
0
32
1.0485 S
1
0
1
64
2.0971 S
1
1
0
128
4.1943 S
1
1
1
256
8.3886 S
WDT overflow time is shown as the bellowed table when SYSclk=11.0592MHz and MCU in 12T mode:
PS2
PS1
PS0
Pre-scale
WDT overflow Time @11.0592MHz
and 12T mode
0
0
0
2
71.1 mS
0
0
1
4
142.2 mS
0
1
0
8
284.4 mS
0
1
1
16
568.8 mS
1
0
0
32
1.1377 S
1
0
1
64
2.2755 S
1
1
0
128
4.5511 S
1
1
1
256
9.1022 S
PS2
PS1
PS0
Pre-scale
WDT overflow Time @20MHz
and 12T mode
0
0
0
2
39.3 mS
0
0
1
4
78.6 mS
0
1
0
8
157.3 mS
0
1
1
16
314.6 mS
1
0
0
32
629.1 mS
1
0
1
64
1.25 S
1
1
0
128
2.5 S
1
1
1
256
5 S
The WDT overflow time is determined by the following equation:
WDT overflow time = (N × Pre-scale × 32768) / SYSclk
When MCU in 12T mode, N=12; When MCU in 6T mode, N=6
The SYSclk=20MHz and MCU in 12T mode in the table above.
If SYSclk=12MHz and MCU in 12T mode, The WDT overflow time is :
WDT overflow time = (12 × Pre-scale × 32768) / 12000000 = Pre-scale× 393216 / 12000000
EN_WDT : Enable WDT bit. When set, WDT is started.
CLR_WDT : WDT clear bit. When set, WDT will recount. Hardware will automatically clear this bit.
IDLE_WDT : WDT IDLE mode bit. When set, WDT is enabled in IDLE mode. When clear, WDT is disabled in
IDLE.
PS2, PS1, PS0 : WDT Pre-scale value set bit.
Pre-scale value of Watchdog timer is shown as the bellowed table :
18



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