AT89C51AC3-RDTIM datasheet(80/140 Pages) ATMEL

部件名	AT89C51AC3-RDTIM

功能描述	Enhanced 8-bit Microcontroller with 64KB Flash Memory

PDF	140 Pages

Scroll/Zoom	100%

制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

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80 / 140 page

AT89C51AC3

4383D–8051–02/08

Watchdog Programming

The three lower bits (S0, S1, S2) located into WDTPRG register permit to program the

WDT duration.

Table 42. 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 43. Time-Out Computation

Machine Cycle Count

214 - 1

215 - 1

216 - 1

217 - 1

218 - 1

219 - 1

220 - 1

221 - 1

Fosc = 12 MHz

Fosc = 16 MHz

Fosc = 20 MHz

16.38 ms

12.28 ms

9.82 ms

32.77 ms

24.57 ms

19.66 ms

65.54 ms

49.14 ms

39.32 ms

131.07 ms

98.28 ms

78.64 ms

262.14 ms

196.56 ms

157.28 ms

524.29 ms

393.12 ms

314.56 ms

1.05 s

786.24 ms

629.12 ms

2.10 s

1.57 s

1.25 s

FTime

Out

w d

Svalue

(

)

–

(

)

-----------------------------------------------------------------

–

AT89C51AC3-RDTIM 数据表(PDF) 80 Page - ATMEL Corporation

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