MC908QL4 FREESCALE [Freescale Semiconductor, Inc], MC908QL4 Datasheet - Page 56

• Manufacturer Part Number: MC908QL4
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Analog-to-Digital Converter (ADC10) Module
ADLSMP — Long Sample Time Configuration
ACLKEN — Asynchronous Clock Source Enable
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This bit configures the sample time of the ADC10 to either 3.5 or 23.5 ADCK clock cycles. This adjusts
the sample period to allow higher impedance inputs to be accurately sampled or to maximize
conversion speed for lower impedance inputs. Longer sample times can also be used to lower overall
power consumption in continuous conversion mode if high conversion rates are not required.
This bit enables the asynchronous clock source as the input clock to generate the internal clock ADCK,
and allows operation in stop mode. The asynchronous clock source will operate between 1 MHz and
2 MHz if ADLPC is clear, and between 0.5 MHz and 1 MHz if ADLPC is set.
1 = Long sample time (23.5 cycles)
0 = Short sample time (3.5 cycles)
1 = The asynchronous clock is selected as the input clock source (the clock generator is only
0 = ADICLK specifies the input clock source and conversions will not continue in stop mode
enabled during the conversion)
MC68HC908QL4 Data Sheet, Rev. 7
Freescale Semiconductor