Rainbow-electronics T89C51CC02 Uživatelský manuál stáhnout pdf (Strana 117)

Rev.A - May 17, 2001 117

Preliminary

T89C51CC02

17.6. Clock Selection

The maximum clock frequency for ADC is 700KHz. A prescaler is featured (ADCCLK) to generate the ADC

clock from the oscillator frequency.

Figure 119. A/D Converter clock

17.7. ADC Standby Mode

When the ADC is not used, it is possible to set it in standby mode by clearing bit ADEN in ADCON register.

In this mode the power dissipation is about 1uW.

Prescaler ADCLK

A/D

Converter

conversion clock f

ADC

CPU

CLOCK

CPU Core Clock Symbol

÷ 2

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 136 137

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Rainbow-electronics T89C51CC02 Uživatelský manuál Strana 117