mc68hc908gp32 Freescale Semiconductor, Inc, mc68hc908gp32 Datasheet - Page 58

• Manufacturer Part Number: mc68hc908gp32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital Converter (ADC)
4.7.2 ADC Data Register
One 8-bit result register, ADC data register (ADR), is provided. This register is updated each time an ADC
conversion completes.
4.7.3 ADC Clock Register
The ADC clock register (ADCLK) selects the clock frequency for the ADC.
ADIV2–ADIV0 — ADC Clock Prescaler Bits
58
ADIV2–ADIV0 form a 3-bit field which selects the divide ratio used by the ADC to generate the internal
ADC clock.
approximately 1 MHz.
Address:
Address:
Table 4-2
Reset:
Reset:
Read:
Read:
Write:
Write:
$003D
$003E
ADIV2
X = don’t care
Bit 7
AD7
Bit 7
0
0
shows the available clock configurations. The ADC clock should be set to
ADIV2
0
0
0
0
1
Figure 4-4. ADC Clock Register (ADCLK)
= Unimplemented
= Unimplemented
ADIV1
Figure 4-3. ADC Data Register (ADR)
AD6
6
0
6
0
Table 4-2. ADC Clock Divide Ratio
MC68HC908GP32 Data Sheet, Rev. 10
ADIV1
X
0
0
1
1
ADIV0
AD5
5
0
5
0
ADIV0
0
1
0
1
X
ADICLK
AD4
4
0
4
0
ADC input clock ÷ 1
ADC input clock ÷ 2
ADC input clock ÷ 4
ADC input clock ÷ 8
ADC input clock ÷ 16
AD3
3
0
3
0
0
ADC Clock Rate
AD2
2
0
2
0
0
AD1
1
0
1
0
0
Freescale Semiconductor
Bit 0
AD0
Bit 0
0
0
0