T89C5115-RATIM datasheet(68/113 Pages) ATMEL

Part #	T89C5115-RATIM

Description	Low Pin Count 8-bit Microcontroller with A/D Converter and 16 KBytes Flash Memory

PDF	113 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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68 / 113 page

AT89C5115

4128G–8051–02/08

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 fOSCXTAL = 12 MHz in X1 mode

Table 50. Timeout Computation

Machine Cycle Count

214 - 1

215 - 1

216 - 1

217 - 1

218 - 1

219 - 1

220 - 1

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

o sc

WD X

∧

Sva lu e

(

)

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T89C5115-RATIM Datasheet(PDF) 68 Page - ATMEL Corporation

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