AT89C5115-RATUM datasheet(68/113 Pages) ATMEL

部件名	AT89C5115-RATUM

功能描述	Low Pin Countl 8-bit Microcontroller with A/D Converter and 16 KBytes Flash Memory

PDF	113 Pages

Scroll/Zoom	100%

制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

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68 / 113 page

AT89C5115

4128F–8051–05/06

Watchdog Programming

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

WDT duration.

Table 49. Machine Cycle Count

To compute WD Timeout, the following formula is applied:

Note:

Svalue represents the decimal value of (S2 S1 S0)

Find Hereafter computed Timeout values for f

OSCXTAL = 12 MHz in X1 mode

Table 50. Timeout Computation

Machine Cycle Count

000

14 - 1

001

215 - 1

010

216 - 1

011

217 - 1

100

218 - 1

101

19 - 1

110

20 - 1

111

221 - 1

fOSC=12 MHz

fOSC=16MHz

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

Fosc

WDX2 X2

∧

Svalue

()

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

–

AT89C5115-RATUM 数据表(PDF) 68 Page - ATMEL Corporation

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