參數(shù)資料
型號: T89C51AC2-SLSIM
廠商: Atmel
文件頁數(shù): 92/121頁
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44PLCC
標準包裝: 27
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 2K x 8
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
72
A/T89C51AC2
4127H–8051–02/08
Watchdog Programming
The three lower bits (S0, S1, S2) located into WDTPRG register permit to program the
WDT duration.
Table 51. Machine Cycle Count
To compute WD Time-Out, the following formula is applied:
Note:
Svalue represents the decimal value of (S2 S1 S0)
The following table outlines the time-out value for FoscXTAL = 12 MHz in X1 mode
Table 52. Time-Out Computation
S2
S1
S0
Machine Cycle Count
0
214 - 1
0
1
215 - 1
0
1
0
216 - 1
0
1
217 - 1
1
0
218 - 1
1
0
1
219 - 1
1
0
220 - 1
1
221 - 1
S2
S1
S0
Fosc = 12 MHz
Fosc = 16 MHz
Fosc = 20 MHz
0
16.38 ms
12.28 ms
9.82 ms
0
1
32.77 ms
24.57 ms
19.66 ms
0
1
0
65.54 ms
49.14 ms
39.32 ms
0
1
131.07 ms
98.28 ms
78.64 ms
1
0
262.14 ms
196.56 ms
157.28 ms
1
0
1
524.29 ms
393.12 ms
314.56 ms
1
0
1.05 s
786.24 ms
629.12 ms
1
2.10 s
1.57 s
1.25 s
FTime
Out
F
o sc
6
2
×
WD X
2
X
2
2
14
2
Sva lu e
×
(
)
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=
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