MC68HC908AS32AVFN View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

MFG CO.

MC68HC908AS32AVFN

Microcontrollers

Freescale Semiconductor 

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Analog-to-Digital Converter (ADC)

ADICLK — ADC Input Clock Register Bit

ADICLK selects either bus clock or CGMXCLK as the input clock source to generate the internal ADC

clock. Reset selects CGMXCLK as the ADC clock source.

If the external clock (CGMXCLK) is equal to or greater than 1 MHz, CGMXCLK can be used as the

clock source for the ADC. If CGMXCLK is less than 1 MHz, use the PLL-generated bus clock as the

clock source. As long as the internal ADC clock is at approximately 1 MHz, correct operation can be

guaranteed. See 19.7 Analog-to-Digital Converter (ADC) Characteristics.

1 = Internal bus clock

0 = External clock (CGMXCLK)

1 MHz = ⎯fX⎯CL⎯K o⎯r ⎯Bu⎯s ⎯Fr⎯eq⎯ue⎯nc⎯y

ADIV[2:0]

NOTE

During the conversion process, changing the ADC clock will result in an

incorrect conversion.

MC68HC908AS32A Data Sheet, Rev. 2.0

66

Freescale Semiconductor

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