mc68hc08az60 Freescale Semiconductor, Inc, mc68hc08az60 Datasheet - Page 405

• Manufacturer Part Number: mc68hc08az60
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

11-adc-15
MOTOROLA
NOTE:
ADICLK — ADC Input Clock Register Bit
During the conversion process, changing the ADC clock will result in an
incorrect conversion.
Freescale Semiconductor, Inc.
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
Characteristics
For More Information On This Product,
1 = Internal bus clock
0 = External clock (CGMXCLK)
Analog-to-Digital Converter (ADC-15)
Go to: www.freescale.com
X = don’t care
ADIV2
1 MHz =
0
0
0
0
1
Table 2. ADC Clock Divide Ratio
on page 413.
ADIV1
X
0
0
1
1
f
XCLK
or Bus Frequency
ADIV0
ADIV[2:0]
X
0
1
0
1
Analog-to-Digital Converter (ADC-15)
ADC Input Clock / 16
ADC Input Clock / 2
ADC Input Clock / 4
ADC Input Clock / 8
ADC Input Clock /1
ADC Clock Rate
MC68HC08AZ60 — Rev 1.0
I/O Registers
ADC
405