T89C51AC2-RLSI-M datasheet(71/117 Pages) ATMEL

Part #	T89C51AC2-RLSI-M

Description	8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM

PDF	117 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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71 / 117 page

Draft.A - March 30, 2001

Preview - Confidential

T89C51AC2

14.2. WatchDog Programming

The three lower bits (S0, S1, S2) located into WDTPRG register permits to program the WDT duration.

Table 19. Machine Cycle Count

To compute WD Time-Out, the following formula is applied:

Note: Svalue represents the decimal value of (S2 S1 S0)

Find Hereafter computed Time-Out value for FoscXTAL = 12MHz

Table 20. Time-Out Computation

Machine Cycle Count

000

214 -1

001

215 -1

010

216 -1

011

217 -1

100

218 -1

101

219 -1

110

220 -1

111

221 -1

Fosc=12MHz

Fosc=16MHz

Fosc=20MHz

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 ms

FTime

Out

XTAL

Svalue

() 1

–

()

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

–

T89C51AC2-RLSI-M Datasheet(PDF) 71 Page - ATMEL Corporation

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