MC908AZ32ACFUE Datasheet, PDF (235/324 Pages) Freescale Semiconductor, Inc – Microcontrollers

I/O Registers
ADIV2–ADIV0 — ADC Clock Prescaler Bits
ADIV2, ADIV1, and ADIV0 form a 3-bit field which selects the divide ratio used by the ADC to generate
the internal ADC clock. Table 21-2 shows the available clock configurations. The ADC clock should be
set to approximately 1 MHz.
Table 21-2. ADC Clock Divide Ratio
ADIV2 ADIV1
0
0
0
0
0
1
0
1
1
X
X = don’t care
ADIV0
0
1
0
1
X
ADC Clock Rate
ADC Input Clock /1
ADC Input Clock / 2
ADC Input Clock / 4
ADC Input Clock / 8
ADC Input Clock / 16
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 25.1.6 ADC Characteristics.
1 = Internal bus clock
0 = External clock (CGMXCLK)
1 MHz = ⎯^fX⎯^CL⎯^K ⎯^or⎯^B⎯^us⎯^Fr⎯^eq⎯^ue⎯ⁿ⎯^cy
ADIV[2:0]
NOTE
During the conversion process, changing the ADC clock will result in an
incorrect conversion.
MC68HC908AZ32A Data Sheet, Rev. 2
Freescale Semiconductor
235