MC68HC08AS32 Datasheet, PDF (318/394 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Analog-to-Digital Converter (ADC)
19.8.2 ADC Data Register
One 8-bit data register is provided. This register is updated each time an
ADC conversion completes.
Address: $0039
Bit 7
6
5
4
3
2
1
Bit 0
Read: AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
Write: R
R
R
R
R
R
R
R
Reset:
Unaffected by Reset
R = Reserved
Figure 19-3. ADC Data Register (ADR)
19.8.3 ADC Input Clock Register
This register selects the clock frequency for the ADC.
Address: $003A
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
ADIV2 ADIV1 ADIV0 ADICLK
Write:
R
R
R
R
Reset: 0
0
0
0
0
0
0
0
R = Reserved
Figure 19-4. ADC Input Clock Register (ADICLK)
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 19-2
shows the available clock configurations. The ADC clock should be
set to approximately 1 MHz.
Advance Information
318
Analog-to-Digital Converter (ADC)
MC68HC08AS32 — Rev. 3.0
MOTOROLA