Freescale Semiconductor MCF51QE128RM manual Chapter Analog-to-Digital Converter S08ADC12V1

Chapter 11

Analog-to-Digital Converter (S08ADC12V1)

11.1Introduction

The 12-bit analog-to-digital converter (ADC) is a successive approximation ADC designed for operation within an integrated microcontroller system-on-chip.

Figure 11-1shows the MCF51QE128 Series with the ADC module and pins highlighted.

NOTE

Ignore any references to stop1 low-power mode in this chapter, because the

MCF51QE128 device does not support it.

11.1.1ADC Clock Gating

The bus clock to the ADC can be gated on and off using the SCGC1[ADC] bit. This bit is set after any reset, which enables the bus clock to this module. To conserve power, the ADC bit can be cleared to disable the clock to this module when not in use. See Section 5.6, “Peripheral Clock Gating,” for details.

MCF51QE128 MCU Series Reference Manual, Rev. 3

Freescale Semiconductor 215

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