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MC908QL4DT Datasheet(PDF) 55 Page - Motorola, Inc |
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MC908QL4DT Datasheet(HTML) 55 Page - Motorola, Inc |
55 / 222 page Registers MC68HC908QL4 • MC68HC908QL3 • MC68HC908QL2 Data Sheet, Rev. 4 Freescale Semiconductor 55 3.8.4 ADC10 Clock Register (ADCLK) This register selects the clock frequency for the ADC10 and the modes of operation. ADLPC — ADC10 Low-Power Configuration Bit ADLPC controls the speed and power configuration of the successive approximation converter. This is used to optimize power consumption when higher sample rates are not required. 1 = Low-power configuration: The power is reduced at the expense of maximum clock speed. 0 = High-speed configuration ADIV[1:0] — ADC10 Clock Divider Bits ADIV1 and ADIV0 select the divide ratio used by the ADC10 to generate the internal clock ADCK. Table 3-3 shows the available clock configurations. ADICLK — Input Clock Select Bit If ACLKEN is clear, ADICLK selects either the bus clock or an alternate clock source as the input clock source to generate the internal clock ADCK. If the alternate clock source is less than the minimum clock speed, use the internally-generated bus clock as the clock source. As long as the internal clock ADCK, which is equal to the selected input clock divided by ADIV, is at a frequency (fADCK) between the minimum and maximum clock speeds (considering ALPC), correct operation can be guaranteed. 1 = The internal bus clock is selected as the input clock source 0 = The alternate clock source IS SELECTED MODE[1:0] — 10- or 8-Bit or Hardware Triggered Mode Selection These bits select 10- or 8-bit operation. The successive approximation converter generates a result that is rounded to 8- or 10-bit value based on the mode selection. This rounding process sets the transfer function to transition at the midpoint between the ideal code voltages, causing a quantization error of ± 1/2LSB. Reset returns 8-bit mode. 00 = 8-bit, right-justified, ADCSC software triggered mode enabled 01 = 10-bit, right-justified, ADCSC software triggered mode enabled 10 = Reserved 11 = 10-bit, right-justified, hardware triggered mode enabled Bit 7 654321 Bit 0 Read: ADLPC ADIV1 ADIV0 ADICLK MODE1 MODE0 ADLSMP ACLKEN Write: Reset: 00000000 Figure 3-7. ADC10 Clock Register (ADCLK) Table 3-3. ADC10 Clock Divide Ratio ADIV1 ADIV0 Divide Ratio (ADIV) Clock Rate 0 0 1 Input clock ÷ 1 0 1 2 Input clock ÷ 2 1 0 4 Input clock ÷ 4 1 1 8 Input clock ÷ 8 |
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