AT89C51RB2/RC2

4180E–8051–10/06

Table 60. WDTPRG Register

WDTPRG - Watchdog Timer Out Register (0A7h)

Reset Value = XXXX X000

WDT During Power-down

and Idle

In Power-down mode the oscillator stops, which means the WDT also stops. While in

Power-down mode the user does not need to service the WDT. There are two methods

of exiting Power-down mode: by a hardware reset or via a level activated external inter-

rupt which is enabled prior to entering Power-down mode. When Power-down is exited

with hardware reset, servicing the WDT should occur as it normally should whenever the

AT89C51RB2/RC2 is reset. Exiting Power-down with an interrupt is significantly differ-

ent. The interrupt is held low long enough for the oscillator to stabilize. When the

interrupt is brought high, the interrupt is serviced. To prevent the WDT from resetting the

device while the interrupt pin is held low, the WDT is not started until the interrupt is

pulled high. It is suggested that the WDT be reset during the interrupt service routine.

To ensure that the WDT does not overflow within a few states of exiting of power-down,

it is better to reset the WDT just before entering power-down.

In the Idle mode, the oscillator continues to run. To prevent the WDT from resetting the

AT89C51RB2/RC2 while in Idle mode, the user should always set up a timer that will

periodically exit Idle, service the WDT, and re-enter Idle mode.

76543210

- - - - - S2 S1 S0

Bit

Number

Bit

Mnemonic Description

Reserved

The value read from this bit is undetermined. Do not try to set this bit.

2S2WDT Time-out Select Bit 2

1S1WDT Time-out Select Bit 1

0S0WDT Time-out Select Bit 0

S1 S0Selected Time-out

000(2

- 1) machine cycles, 16. 3 ms @ F

OSCA

= 12 MHz

001(2

- 1) machine cycles, 32.7 ms @ F

OSCA

= 12 MHz

010 (2

- 1) machine cycles, 65. 5 ms @ F

OSCA

= 12 MHz

011(2

- 1) machine cycles, 131 ms @ F

OSCA

= 12 MHz

100(2

- 1) machine cycles, 262 ms @ F

OSCA

= 12 MHz

101 (2

- 1) machine cycles, 542 ms @ F

OSCA

= 12 MHz

110(2

- 1) machine cycles, 1.05 s @ F

OSCA

= 12 MHz

111 (2

- 1) machine cycles, 2.09 s @ F

OSCA

= 12 MHz

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 126 127

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Inhaltsverzeichnis

Ed. 2 - 2007-06

INDICE GENERALE

IDM-45300302600.tif

C145300602.fm

IDM-45300600301.tif

DATI TECNICI

Importante

IDM-45300601800.tif

Cautela - Avvertenza

Pericolo - Attenzione

(dopo il rodaggio)

Cambio liquido

INDICE ANALITICO

GENERAL INDEX

General information

Warning - Caution

Technical information

VM MOTORI S.P.A. engines

SPECIFICATIONS

Safety information

Operating information

Frequency

Maintenance information

ANALYTIC INDEX

Allgemeine Informationen

Technische Daten

TECHNISCHE DATEN

100

Informationen zur Sicherheit

102

Transportmittel

105

Hubmittel

105

IDM-45300600600.tif

106

IDM-45300600700.tif

106

IDM-45300600800.tif

107

Verschluss (A)

109

Gebrauchshinweise

109

Vorsicht

110

Gefahr - Achtung

111

Informationen zur Wartung

113

Häufigkeit

114

Durchgeführte Wartung

115

Pumpe (G)

121

Ventil (S)

125

Einfüllverschluss (P)

125

IDM-45300302500.tif

129

IDM-45300301700.tif

133

TABLE DES MATIERES

137

Français

138

Informations generales

138

Danger - Attention

139

Précaution - Avertissement

139

Important

139

IDM-45300600100.tif

140

IDM-45300600200.tif

140

Informations techniques

142

DONNÉES TECHNIQUES

144

Informations de securite

146

IDM-45300300700.tif

149

IDM-45300600500.tif

149

Informations d'emploi

153

Fréquence

158

Informations d'entretien

160

ÍNDICE GENERAL

181

Informaciones generales

182

Peligro - atención

183

Precaución - advertencia

183

Informaciones técnicas

186

DATOS TÉCNICOS

188

Informaciones sobre el uso

197

Frecuencia

202

IDM-45300601400.tif

213

IDM-45300601901.ti

216

ÍNDICE ANALÍTICO

223

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Inhaltsverzeichnis

Оглавление

Указания по технике

Защитная одежда

Защитные устройства

Назначение

Защита окружающей среды

Использование по

Элементы прибора

- 5

Управление

- 7

 Опасность

- 9

Настройки

Защита от замерзания

Откачивание антифриза из

Уход и техническое

Поточная схема

- 15

몇 Предупреждение

Неполадки

- 19

Технические данные

Принадлежности и

Гарантия

Заявление о соответствии

02/12

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