mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 161

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

12.8.3 ADC Input Clock Register
MC68HC908BD48
Freescale Semiconductor
—
Rev. 2.1
Address:
This register selects the clock frequency for the ADC.
ADIV2:ADIV0 — ADC Clock Prescaler Bits
Reset:
X = don’t care
Read:
Write:
ADIV2, ADIV1, and ADIV0 form a 3-bit field which selects the divide
ratio used by the ADC to generate the internal ADC clock.
shows the available clock configurations. The ADC clock should be
set to approximately 1MHz. With an internal bus frequency of 6MHz,
set ADIV[2:0] = 010, for a divide by four ADC clock rate.
ADIV2
0
0
0
0
1
ADIV2
$005F
Bit 7
Figure 12-4. ADC Input Clock Register (ADICLK)
Analog-to-Digital Converter (ADC)
0
= Unimplemented
ADIV1
ADIV1
Table 12-3. ADC Clock Divide Ratio
X
0
0
1
1
6
0
ADIV0
5
0
ADIV0
X
0
1
0
1
4
0
0
3
0
0
Analog-to-Digital Converter (ADC)
Internal bus clock ÷ 1
Internal bus clock ÷ 2
Internal bus clock ÷ 4
Internal bus clock ÷ 8
Internal bus clock ÷ 16
ADC Clock Rate
2
0
0
1
0
0
Table 12-3
Data Sheet
Bit 0
0
0
161